# Big Ideas Math Book 2nd Grade Answer Key Chapter 9 Add Numbers within 1,000

Practicing Big Ideas Math Grade 2 Book Chapter 9 Add Numbers within 1,000 will help the students who want to score good marks in the examination. We advise you to refer the different topics such as Add 10 and 100, Use a Number Line to Add Hundreds and Tens, Use a Number Line to Add Three-Digit Numbers, Use Compensation to Add Three-Digit Numbers, Use Partial Sums to Add Three-Digit Numbers, Use Models to Add Three-Digit Numbers, Add Three-Digit Numbers, and so on.

By learning all those lessons, students can know various methods of adding numbers below 1000. Students have to work hard right from the beginning days of their school to be strong in the basics of math. Solve all the questions and verify whether your method of solving and the solution is correct or not by checking Big Ideas Math Book Answers Grade 2 Chapter 9 Add Numbers within 1,000. Tap on the link given below to learn that particular concept.

Vocabulary

Lesson 1 Add 10 and 100

Lesson 2 Use a Number Line to Add Hundreds and Tens

Lesson 3 Use a Number Line to Add Three-Digit Numbers

Lesson 4 Use Compensation to Add Three-Digit Numbers

Lesson 5 Use Partial Sums to Add Three-Digit Numbers

Lesson 6 Use Models to Add Three-Digit Numbers

Lesson 7 Add Three-Digit Numbers

Lesson 8 Add Up to 4 Two-Digit Numbers

Lesson 9 Explain Addition Strategies

### Add Numbers within 1,000 Vocabulary

Organize It
Use the review words to complete the graphic organizer.

Define It

### Lesson 9.1 Add 10 and 100

Explore and Grow

Model 231. Make a quick sketch of your model.

231

Model 10 more than 231. Make a quick sketch of your model.
231 + 10 = _____

Model 100 more than 231. Make a quick sketch of your model.
231 + 100 = _____
Model 10 more than 231. Sketch of it:

231 + 10 = 241.

231 + 100 = 331. Sketch of it:

231 + 100 = 331.

Model 100 more than 231.

Show and Grow

Question 1.
317 + 10 = _____
317 + 100 = _____
317 + 10 = 327.
317 +100 = 417.

Explanation:

Question 2.
168 + 10 = _____
168 + 100 = _____
168 + 10 = 178.
168 + 100 = 268.

Explanation:

.

Question 3.
223 + 10 = _____
223 + 100 = _____
223 + 10 = 233.
223 + 100 = 323.

Explanation:

Question 4.
490 + 10 = ____
490 + 100 = _____

490 + 10 = 500.
490 + 100 = 590.

Explanation:

Apply and Grow: Practice

Question 5.
731 + 10 = _____
731 + 10 = 741

Explanation:

Question 6.
674 + 100 = _____
674 + 100 = 774.

Explanation:

Question 7.
620 + 10 = ____
620 + 10 = 630.

Explanation:

Question 8.
713 + 10 = ____
713 + 10 = 723.

Explanation:

Question 9.
564 + 100 = _____
564 + 100 = 664.

Explanation:

Question 10.
349 + 10 = _____
349 + 10 = 359.

Explanation:

Question 11.
456 + 100 = ____
456 + 100 = 556.

Explanation:

Question 12.
802 + 100 = _____
802 + 100 = 902.

Explanation:

Question 13.
192 + 10 = ____
192 + 10 = 202.

Explanation:

Question 14.
900 + 100 = ____
900 + 100 = 1000.

Explanation:

Question 15.
349 + ____ = 449
349 + 100 = 449.

Explanation:
349 + ??? = 449.
449 – 349 =???
100 = ???
Hence, 349 + 100 = 449.

Question 16.
____ + 10 = 791
781 + 10 = 791.

Explanation:
??? + 10 = 791
791-10 = ???
781 = ???
Hence, 781 + 10 = 791.

Question 17.
Number Sense
Use each number once to complete the equations.

____ + 10 = ____
_____ + _____ = 512
312 + 10 = 322
412 + 10 = 422
100 + 10 = 110
322 + 10 = 332
412 + 100 = 512

Think and Grow: Modeling Real Life

You and a friend play skee ball. Your score is 290. Your friend’s score is 220. On the last roll, you score 10 more and your friend scores 100 more. Who wins?

You Friend
GIVEN:
My score = 290
Friends score = 220
In the last roll,10 runs more my score
=> 290+ 10 = 300.
In the last roll,100 runs more my friend score
=> 220 + 100 = 320.
DIFFERENCE:
My friends score – My score=
320 – 300 = 20 runs.
COMPARE:

Hence, my friend wins the match by 20 runs.

Show and Grow

Question 18.
You and a friend play a card game. Your score is 420. Your friend’s score is 530. In the last round, you score 100 more and your friend scores 10 more. Who wins?

You Friend
GIVEN:
My score = 420
Friends score = 530
In the last round ,100 runs more my score
=> 420+ 100 = 520.
In the last roll,10 runs more my friend score
=> 530 + 10 = 540.
DIFFERENCE:
My friends score – My score=
540 – 520 = 20 .
COMPARE:

Hence, my friend wins the match by 20.

Question 19.
You spin the wheel and score 100 points. Your friend scores 335. On the last spin, you score275 more and your friend scores 10 more. Who wins?

You Friend
GIVEN:
My score = 100 points
Friends score = 335 points
In the last spin ,275 runs more my score
=> 100+ 275 = 375 points.
In the last spin,10 runs more my friend score
=> 335 + 10 = 345 points.
DIFFERENCE:
My  score – My  friends score=
375 – 345 = 30 points.
COMPARE:

Hence, I win the match by 30points.

### Add 10 and 100 Homework & Practice 9.1

Question 1.
850 + 100 = _____
850 +100 =950.

Question 2.
625 + 10 = ____
625 + 10 = 635.

Question 3.
704 + 10 = ____
704 + 10 = 714.

Question 4.
294 + 100 = ____
294 + 100 = 394.

Question 5.
556 + 100 = ____
556 + 100 = 656.

Question 6.
471 + 100 = _____
471 + 100 =571.

Question 7.
308 + 100 = ____
308 + 100 =408.

Question 8.
149 + 10 = _____
149 + 10 =159.

Question 9.
690 + 10 = ____
690 + 10 =700.

Question 10.
990 + 10 = _____
990 + 10 =1000.

Question 11.
621 + ____ = 631
621 + 10 = 631.

Question 12.
____ + 100 = 613
513 + 100 = 613.

Question 13.
YOU BE THE TEACHER
Your friend says that 847 + 10 = 947. Is your friend correct? Explain.
_____________________________
_____________________________
Your friend says that 847 + 10 = 947.
847 + 10 = 857.
Hence, my Friend is not correct because the total is 857 not 947.

Question 14.
Modeling Real Life
You pick 220 blueberries. Your friend picks 200. You pick 10 more and your friend picks 100 more. Who picks more blueberries?

You Friend
GIVEN:
Number of blueberries I picked up  = 220
Number of blueberries my friend picked up = 200
10 more Blueberries I picked up later
Total number of blueberries I has => 220 + 10 = 230.
100 more Blueberries my Friend picked up later
Total number of blueberries my friends has=>200 + 100 =300.
DIFFERENCE:
Total number of blueberries my friends has  – Total number of blueberries I have
=>300 – 230
=> 70.
COMPARE:

Hence, my friend wins because he has 70 blueberries more than me.

Question 15.
Modeling Real Life
You Friend
GIVEN:
Number of songs I downloaded = 100
Number of songs my friend downloaded = 125
Number of songs I downloaded more = 145
Total number of songs I downloaded = 100 + 145 = 245.
Number of songs my friend downloaded more = 10
Total number of songs my friend downloaded = 125 + 10 = 135.
DIFFERENCE:
Total number of songs I downloaded – Total number of songs my friend downloaded
= 245 – 135
= 110.
Hence, I downloaded 110 songs more than my friend.

Review & Refresh

Question 16.

DIFFERENCE:
56 – 8 = 48.

Question 17.

DIFFERENCE:
73 – 5 = 68.

Question 18.

DIFFERENCE:
41 – 26 = 15.

### Lesson 9.2 Use a Number Line to Add Hundreds and Tens

Explore and Grow

Show how to skip count by tens five times on the number line.

154 + _____ = ____

154 + 5(10)
=154 + 50
= 204.
Hence, 154 + 50 = 204.

Show how to skip count by hundreds five times on the number line.
1Q
154 + _____ = _____

154 + 5(100)
=154 + 500
= 654.
Hence, 154 + 500 = 654.

Show and Grow

Question 1.
380 + 340 = ____

380+ 3(100) +40
= 380 + 300 +40
=680 + 40
= 720.
Hence, 380 + 340 = 720.

Question 2.
462 + 270 = _____

462 +2(100) + 70
=462 + 200 + 70
= 662 + 70
=732.
Hence, 462 + 270 = 732.

Apply and Grow: Practice

Question 3.
550 + 210 = _____

550 + 2(100) + 10
= 550 + 200 + 10
= 750 + 10
= 760.
Hence, 550 + 210 = 760.

Question 4.
725 + 160 = ____

725 + 100 + 60
=825 + 60
=885.
Hence, 725 + 160 = 885.

Question 5.
469 + 350 = ____

469 + 3( 100) + 50
= 469 + 300 +50
=769 + 50
=819.
Hence, 469 + 350 = 819.

Question 6.
Reasoning
Complete the number line and the equation.

____ + ____ = _____

720 + 100 + 100
=820 + 100
=920.
SUBTRACTION:
960 -920 = 40
Hence, 720 + 100 +100 +40 =960.

Think and Grow: Modeling Real Life

A post office has 330 large envelopes and some small envelopes. There are560 envelopes in all. How many small envelopes are there?
Model:

______ small envelopes
GIVEN:
Number of large envelopes post office has = 330
Total number of envelopes post office has = 560
Number of small envelopes post office has = ???
=> Total number of envelopes post office has  – Number of large envelopes post office has
=> 560 – 330 = 230.

Hence, Number of small envelopes post office has = 230.

Show and Grow

Question 7.
A postal carrier delivers 280 letters and some post cards. She delivers 390 pieces of mail in all. How many postcards does she deliver?

_____ postcards
GIVEN:
Number of letters delivered by postal carrier = 280
Total Number of pieces mails delivered by the postal carrier = 390
Number of postcards delivered by the postal carrier = ???
=>Total Number of pieces mails delivered by the postal carrier  –  Number of letters delivered by postal carrier
=>  390 – 280 = 110.
Hence, the number of postcards delivered by the postal carrier = 110.

Question 8.
There are some children and 180 adults on a subway. There are 300 passengers in all. How many children are there?

_____ children
GIVEN:
Number of adults on the subway = 180
Total number of passengers on the subway = 300
Number of children on the subway = ???
=> Total number of passengers on the subway – Number of adults on the subway
=> 300 – 180
=> 120.
Hence, the Number of children on the subway = 120.

### Use a Number Line to Add Hundreds and Tens Homework & Practice 9.2

Question 1.
150 + 610 = _____

150 + 6(100) + 10
=> 150 +600 + 10
=> 750 +10
=>760.
Hence, 150 + 610 = 760.

Question 2.
291 + 450 = ____

291 + 4(100) + 5(10)
=> 291 + 400 +50
=> 691 + 50
=> 741.
Hence, 291 + 450 = 741.

Question 3.
553 + 250 = _____

553 +2(100) +5(10)
=>553 + 200 + 50
=>753 + 50
=>803.
Hence, 553 + 250 = 803.

Question 4.
Number Sense
Write the equation shown by the number line.

____ + ____ = ______
430 + 100  +100  +100 + 10 + 10
=>530 +100+ 100 + 10 + 10
=> 630 + 100 + 10 + 10
=> 730 +  10 + 10
=> 740 + 10
=> 750.
Hence, 430 + 100  +100  +100 + 10 + 10 = 750.

Question 5.
Modeling Real Life
A carpenter has 320 nails and some screws. There are 470 nails and screws in all. How many screws are there?

______ screws
GIVEN:
Number of nails a carpenter has = 320
Total number of nails and screws a carpenter has = 470
Number of screws a carpenter has = ??
SUBTRACTION:
Number of screws a carpenter has = Total number of nails and screws a carpenter has – Number of nails a carpenter has
= 470 – 320
=150.
Hence, Number of screws a carpenter has = 150.

Question 6.
Modeling Real Life
A concession stand sells some drinks and 260 hot dogs. There were 400 drinks and hot dogs sold in all. How many drinks were sold?
______ drinks
GIVEN:
Number of hot dogs a concession stand sells = 260
Total number of drink a concession stand sold = 400
Number of drinks sold = ??
SUBTRACTION:
Number of drinks sold = Total number of drink a concession stand sold – Number of hot dogs a concession stand sells
= 400 – 260
= 140.
Hence, Number of drinks sold = 140.

Review & Refresh

Question 7.
Show 416 two ways.

ONE WAY: TABLE WAY

=> 4(100) + 1(10)  + 6(1)
=> 400 + 10 + 6
=> 410 + 6
=>416.
OTHER WAY: NUMBER LINE WAY

0+4(100) +1(10) + 6(1)
= 0 + 400 + 10 + 6
= 400 + 10 + 6
= 410 + 6
= 416.

### Lesson 9.3 Use a Number Line to Add Three-Digit Numbers

Explore and Grow

Use each sum as the missing addend in the next equation.
425 + 200 = ____

How does this help you find 425 + 222?
___________________
____________________
GIVEN:
To Find 425 + 222 = ???
425 + 200 = 625.

625 + 20 = 645.

645 + 2 = 647.

Hence, 425 + 222 = 647.

Show and Grow

Question 1.
371 + 145 = ______

371 + 100 +45
= 471 + 45
= 516.
Hence, 371 + 145 = 516.

Question 2.
419 + 237 = ______

419 + 100 + 100 + 37
=519 + 100 + 37
=619 +37
= 656.
Hence, 419 + 237 = 656.

Apply and Grow: Practice

Question 3.
524 + 312 = _____

524 + 100 + 100 + 100 +12
= 624 + 100 + 100 +12
= 724 + 100 +12
= 824 + 12
= 836.
Hence, 524 + 312 = 836.

Question 4.
645 + 108 = ____

645 + 100 + 8
= 745 + 8
= 753.
Hence, 645 + 108 = 753.

Question 5.
836 + 74 = ____

836 + 74
= 910.
Hence, 836 + 74 = 910.

Question 6.
Number Sense
Write the equation shown by the number line.

_____ + ______ = ______
EQUATION:
326+ 200 + 50 + 2
= 526 +  50 + 2
= 576 + 2
=578.
Hence, 326+ 200 + 50 + 2 = 578.

Think and Grow: Modeling Real Life

There are 289 boys and 323 girls running in a race. How many runners are there in all?
Model:

_____ runners
Number of boys running in the race = 289
Number of girls running in the race = 323
Total Number of runners in all = ???
Total Number of runners in all = Number of boys running in the race – Number of girls running in the race
= 289 + 323
= 612.

Hence, Total Number of runners in all = 612.

Show and Grow

Question 7.
A textbook has 478 pages in Volume 1 and443 pages in Volume 2. How many pages are there in all?

_____ pages
Total number of pages in the text book = 921.
Number of pages in Volume 1 in the text book = 478
Number of pages in Volume 2 in the text book = 443
Total number of pages in the text book = ???
Total number of pages in the text book = Number of pages in Volume 1 in the text book + Number of pages in Volume 2 in the text book
= 478 + 443
= 921.
Hence, the total number of pages in the text book = 921.

Question 8.
DIG DEEPER!
The pictures show your fitness tracker before and after you take a walk. How many steps did you take on your walk?

_____ steps

Total number of steps taken in the walk = 1027.

Explanation:
GIVEN:
Number of steps took after = 132
Number of steps took after = 895
Total number of steps taken in the walk = ???
Total number of steps taken in the walk = Number of steps took after + Number of steps took after
= 132 + 895
= 1027.
Hence, Total number of steps taken in the walk = 1027.

### Use a Number Line to Add Three-Digit Numbers Homework & Practice 9.3

Question 1.
291 + 407 = _____

291 + 407 = 698.

Explanation:

291 + 100 +100 + 100 + 100 + 7
= 391 + 100 + 100 + 100 + 7
= 491 + 100 + 100 + 7
= 591 + 100 + 7
= 691 + 7
= 698.
Hence, 291 + 407 =698.

Question 2.
752 + 138 = ____

752 + 138 = 890.

Explanation:

752 + 100 + 38
= 852 + 38
= 890.
Hence, 752 + 138 = 890.

Question 3.
372 + 319 =_____

372 + 319 = 691.

Explanation:

372 + 100 + 100 + 100 + 19
= 472 + 100 + 100 + 19
= 572 + 100 + 19
= 672 + 19
= 691.
Hence, 372 + 319 = 691.

Question 4.
Structure
Use the number lines to show 257 + 321 two ways.

257 + 321 = _____
257 + 321 = 578.

Explanation:
ONE WAY: NUMBERLINE REPRESENTATION

OTHER WAY: EQUATION WAY REPRESENTATION:
257 + 100 + 100 + 100 + 21
= 357 + 100 + 100 + 21
= 457+ 100 + 21
= 557 + 21
= 578.
Hence, 257 + 321 = 578.

Question 5.
Modeling Real Life
A florist has 416 daisies and152 roses. How many flowers are there in all?

______ ﬂowers
Total number of flowers a florist has = 568.

GIVEN:
Number of daisies a florist has = 416
Number of roses a florist has = 152
Total number of flowers a florist has = ???

Explanation:
Total number of flowers a florist has = Number of daisies a florist has
Number of roses a florist has
= 416 + 152
= 568.
Hence, Total number of flowers a florist has = 568.

Question 6.
DIG DEEPER!
A school has 872 students.139 students are in the second grade. How many students are not in second grade?
______ students
Number of students not in second grade = 733.

GIVEN:
Total number of students present in school =872
Number of students in second grade = 139
Number of students not in second grade = ???

Explanation:
SUBTRACTION:
Number of students not in second grade = Total number of students present in school – Number of students in second grade
= 872 – 139
= 733.
Hence, Number of students not in second grade = 733.

Review & Refresh

Draw more lines to show fourths.
Question 7.

Explanation:
1/4 of the figure is shaded.

Question 8.

Explanation:
3/4 of the figure is shaded.

### Lesson 9.4 Use Compensation to Add Three-Digit Numbers

Explore and Grow

Add to the model to make 300. Make a quick sketch of your work.

What number did you add to make 300? _____
How can this help you find 296 + 124?
____________________
____________________

GIVEN:
In the figure given, the number count is 296.
given number = 300
what should be added to 296 to make 300?
SUBTRACTION:
300 – 296 = 4.

Hence, 4 should b added to 296 to make it 300.

This help in the calculating the sum easily .
296 + 124 = 420.

Show and Grow

Question 1.
Use compensation to add.

GIVEN:
294 + 148 =??
Add 6 to 294.
subtract 6 from 148.
294 + 148
+6        -6
300 + 142 = 442.
Hence, 294 + 148 = 442.

Apply and Grow: Practice

Use compensation to add.
Question 2.

GIVEN:
628 + 206 = ???
Add 2 to 628
Subtract 2 from 206.
628  +  206
+  2        – 2
630  +   204 = 834.
Hence, 628 + 206 = 834.

Question 3.

703 + 145 =???
Add 5 to 145.
Subtract 5 from 703.
703 + 145
–  5     + 5
698 +  150 = 848.
Hence, 703 + 145 = 848.

Question 4.
490 + 367 = ?

____ + ____ = _____
490 + 367 =??
Add 3 to 367.
Subtract 3 from 490.
490  +  367
–  3       + 3
487  +  370 = 857.
Hence, 490 + 367 = 857.

Question 5.
172 + 520 = ?

_____ + _____ = ______
172 + 520 =???
Add 8 to 172.
Subtract 8 from 520.
172   +    520
+ 8         –   8
180   +    512 =  692.
Hence, 172 + 520 = 692.

Question 6.
614 + 275 = ______
614  + 275 =???
Add 6 to 614.
Subtract 6 from 275.
614    +   275
+6           –  6
620    +   269 = 889.
Hence,  614 + 275 =889.

Question 7.
308 + 549 = _____
308 + 549 = ???
Add 2 to 308.
Subtract 2 from 549.
308   +    549
+2            – 2
310   +    547 = 857.
Hence, 308 + 549 = 857.

Question 8.
Reasoning
Show two different ways to use compensation to find 406 + 113.

ONE WAY:
406 + 113 = ??
Add 4 to 406.
Subtract 4 from 113.
406     +    113
+ 4            –  4
410     +    109 = 519.

OTHER WAY:
406 + 113 = ???
Add 7 to 113.
Subtract 7 from 406.
406     +    113
–  7            + 7
399   +      120 = 519.
Hence, 399 + 120 = 519.

Think and Grow: Modeling Real Life

You want to raise $500 in 2 days. Do you reach your goal? Addition equation: Yes No Answer: GIVEN: You want to raise$500 in 2 days.
Amount raised in day 1 = $283 Amount raised in day 2 =$205
Total amount raised in day 1 and day 2 = $283 +$205 = $488. SUBTRACTION: Amount to be raised in two days =$500
Difference in amount = Amount to be raised in two days – Total amount raised in day 1 and day 2
= $500 –$488
= $2. Hence, more$2 required to reach the goal.

Show and Grow

Question 9.
A museum wants a weekend total of 700 guests. Does the museum reach the goal?

Yes No
GIVEN:
Total guests in the museum = 700
Number of guests on Saturday = 338
Number of guests on Sunday = 389
Total number of guests on Saturday and Sunday = 338 + 389 = 727
SUBTRACTION:
Difference in the guests total = Total number of guests on Saturday and Sunday – Total guests in the museum
= 727 – 700 = 27.
Hence, the museum reaches the goal by 27 guests more.

Question 10.
DIG DEEPER!
You want to score 400 in 3 bowling games. What score do you need in the third game to reach your goal?

Score to be needed  in 3 bowling games = 400
Score in game 1 = 107
Score in game 2 = 144
Total score in game 1 and game 2 = 107 + 144 = 251.
SUBTRACTION:
Score needed in the third game to reach your goal = score to be needed  in 3 bowling games – Total score in game 1 and game 2
= 400 – 251
= 149.
Hence, Score needed in the third game to reach your goal = 149.

### Use Compensation to Add Three-Digit Numbers Homework & Practice 9.4

Use compensation to add.
Question 1.

393 + 122 = ???
Add 7 to 393.
Subtract 7 from 122.
393   +   122
+7          –  7
400    +  115 = 515.
Hence, 393 + 122 = 515.

Question 2.

GIVEN:
106 + 614 =???
Add 4 to 106.
Subtract 4 from 614.
106     +    614
+4              – 4
110     +    610 = 720.
Hence, 106 + 614 = 720.

Question 3.
237 + 315 = ?

_____ + _____ = ______
GIVEN:
237 + 315 = ???
Add 3 to 237
Subtract 3 from 315
237   +   315
+ 3          –  3
240   +   312 = 552.
Hence, 237 + 315 = 552.

Question 4.
285 + 320 = ?

_____ + _____ = _____
GIVEN:
285  +  320 ==?
Add 5 to 285
Subtract 5 from 320
285   +  320
+ 5         – 5
290   +  315 = 605.
Hence, 285 + 320 = 605.

Question 5.
YOU BE THE TEACHER
Your friend uses compensation to find 550 + 298. Is your friend correct? Explain.

GIVEN:
550 + 298 = 852
550   +  298
Add 2 to 298
Subtract 2 from 550
550   +   298
– 2         +  2
552   +   300 = 852.
Hence, my friend compensation is correct because 550 + 298 = 852.

Question 6.
Modeling Real Life
Newton wants to read 571 pages in two weeks. He reads 321 pages in the first week and196 pages in the second week. Does he reach his goal?

Yes No
GIVEN:
Total number pages newton wants to read in two weeks = 571
Number of pages he read in first week = 321
Number of pages he read in second week = 196
Did he reach his goal ??
Total number of pages he read in first week and second week = 321 + 196 = 517
SUBTRACTION:
Number of pages left for reading by newton =  Total number pages newton wants to read in two weeks – Total number of pages he read in first week and second week
= 571 – 517
= 54.
Hence ,No Newton did not reach his goal because he read only 517 pages out of 571 pages.

Question 7.
DIG DEEPER!
You need 850 points to get to level 4 in a video game. How many points do you need in level 3to reach your goal?

______ points
GIVEN:
Total points to go into level 4 in a video game = 850
Scored points in level 1 = 348
Scored points in level 2 = 297
Needed points in level 3 =???
Total points scored in both level 1 and level 2 in a video game = 348 +297 = 645.
SUBTRACTION:
Needed points in level 3 = Total points to go into level 4 in a video game – Total points scored in both level 1 and level 2 in a video game
= 850 – 645
= 205.
Hence, Needed points in level 3 = 205.

Review & Refresh

Question 8.

SUBTRACTION:
95 – 38 = 57.
Hence, difference of 95 – 38 = 57.

Question 9.

SUBTRACTION:
82 – 40 = 42.
Hence, difference of 82 – 40 = 42.

Question 10.

SUBTRACTION:
59 -21 =38.
Hence, difference of 59 -21 = 38.

### Lesson 9.5 Use Partial Sums to Add Three-Digit Numbers

Explore and Grow

Model each number. Make quick sketches of your models. Then solve.

_____ + ____ = _____
324 + 215 = _____

Hence, 324 + 215 = 539.

Show and Grow

Question 1.

236 + 359 = ???
236 + 359 = 695.
Hence,  Sum of 236 + 359 = 695.

Question 2.

582 + 173 =???
582 + 173 = 755.
Hence, Sum of 582 + 173 = 755.

Question 3.

364 + 432 = ???
364 + 432 = 796.
Hence, Sum of 364 + 432 = 796.

Question 4.

454  + 488 = ???
454  + 488 = 942.
Hence, Sum of 454  + 488 = 942.

Question 5.

145 + 341 = ???
145 + 341 = 486.
Hence, Sum of 145 + 341 = 486.

Question 6.

576 + 248 = ???
576 + 248 = 824.
Hence, Sum of 576 + 248 = 824.

Apply and Grow: Practice

Question 7.

217 + 435 =???
217 + 435 = 652.
Hence, Sum of  217 + 435 = 652.

Question 8.

532 + 129 = ???
532 + 129 = 661.
Hence, sum of 532 + 129 = 661.

Question 9.

651 + 237 = ???
651 + 237 = 888.
Hence, Sum of 651 + 237 = 888.

Question 10.

779 + 130 = ???
779 + 130 = 909.
Hence, Sum of 779 + 130 = 909.

Question 11.

362 + 217 = ???
362 + 217 = 579.
Hence, Sum of 362 + 217 = 579.

Question 12.

806 + 115 = ???
806 + 115 = 921.
Hence, Sum of 806 + 115 = 921.

Question 13.

448 + 312 = ???
448 + 312 = 760.
Hence, Sum of 448 + 312 = 760.

Question 14.

581 + 243 = ???
581 + 243 = 824.
Hence, Sum of 581 + 243 = 824.

Question 15.
Which One Doesn’t Belong?
Which expression does not belong with the other three?
200 + 300 + 50 + 20 + 5 + 6
581
500 + 70 + 11
500 + 80 + 5 + 6
Expression 1:
200 + 300 + 50 + 20 + 5 + 6
=500 + 50 + 20 + 5 + 6
= 550 + 20 + 5 + 6
= 570 + 5 + 6
= 575 + 6
= 581.
Expression 2:
581
Expression 3:
500 + 70 + 11
= 570 + 11
= 581.
Expression 4:
500 + 80 + 5 + 6
=580 + 5 +6
= 585 + 6
= 591.
Hence, Expression 4 does not belong with the other three Expressions because the number given is not matching other three answers..

Think and Grow: Modeling Real Life

A video rental store has 348 fewer video games than movies. There are 116 video games. How many movies are there?
Model:

_____ movies
GIVEN:
Number of video games a video rental store has= 116
Let the number of movies be X
Difference of video games and movies = 348
EQUATION:
X – 116 = 348
=> X = 348 + 116
=> X = 464.

Hence, the number of movies rental store has = 464.

Show and Grow

Question 16.
A library has 477 fewer magazines than books. There are 243 magazines. How many books are there?

____ books
GIVEN:
Let the number of books = X
Number of magazines = 243
Difference of books and magazines = 477
EQUATION:
=> X – 243 = 477
=> X = 477 +243
=> X = 720
Hence, total number of books in the library = 720.

Question 17.
A clothing store has some shirts on hangers. There are 214 shirts on shelves. The store has 356 shirts in all. How many shirts are on hangers?

_____ shirts
Number of shirts in all clothing store has = 356
Number of shirts on shelves = 214
Number of shirts on hangers = ???
SUBTRACTION:
Number of shirts on hangers = Number of shirts in all clothing store has – Number of shirts on shelves
= 356 -214 = 142.
Hence, Number of shirts on hangers = 142.

### Use Partial Sums to Add Three-Digit Numbers Homework & Practice 9.5

Question 1.

442 + 215 = 657.
Hence, Sum of 442 + 215 = 657.

Question 2.

336 +465 = 801.
Hence, Sum of 336 +465 = 801.

Question 3.

451 + 401 = 852.
Hence, Sum of 451 + 401 = 852.

Question 4.

371 +248 = 619.
Hence, Sum of 371 +248 = 619.

Question 5.

672 + 283 = 955.
Hence, Sum of 672 + 283 = 955.

Question 6.

527 + 106 = 633.
Hence, Sum of 527 + 106 = 633.

Question 7.
DIG DEEPER!
Find the missing digits. Then find the sum.

GIVEN:
Hundreds = 7
Tens = 0
Ones = 8
EXPLANATION:
— 4  5
+ 3 —  3
= 7  0  8
4 + 6 = 10
1 + 3 + 3 =7
MISSING NUMBERS ARE :
Hundreds place = 3
tens place = 6
ADDITION: 345 + 363 = 708.
Hence, missing numbers are 3 and 6.

Question 8.
Modeling Real Life
There are 180 fewer muffins than rolls. There are 425 muffins. How many rolls are there?
______ rolls
Total number of muffins = 425
Let the number of rolls be X
Difference  in the muffins and rolls = 180
EQUATION:
X – 180 = 425
=> X = 425 – 180
=> X = 245
Hence, the number of rolls = 245.

Question 9.
Modeling Real Life
A truck driver drives 672 miles on Monday. He drives some more miles on Tuesday. He drives 954 miles in all. How many miles did he drive on Tuesday?
_____ miles
GIVEN:
Number of miles driver drove on Monday = 672
Number of miles driver drove in all = 954
Number of miles driver drove on Tuesday = ???
SUBTRACTION:
Number of miles driver drove on Tuesday = Number of miles driver drove in all – Number of miles driver drove on Monday
= 954 – 672
= 282.
Hence, Number of miles driver drove on Tuesday = 282.

Review & Refresh

Question 10.
Circle the closed shapes with only 3 vertices.

Hence, shapes having only 3 vertices are circled.

### Lesson 9.6 Use Models to Add Three-Digit Numbers

Explore and Grow

Model to solve. Make a quick sketch of your model.

GIVEN:
327 + 458 =???

327 + 458 = 785.
Hence, Sum of 327 + 458 = 785.

Show and Grow

Question 1.
383 + 255 = ?

GIVEN:
383 + 255 = ???

383 + 255 = 638.
Hence, Sum of 383 + 255 = 638.

Apply and Grow: Practice

Question 2.
238 + 354 = ?

GIVEN:
238 + 354 = ???

238 + 354 = 592.
Hence, Sum of 238 + 354 = 592.

Question 3.
692 + 147 = ?

GIVEN:
692 + 147 = ???

692 + 147 =  839
Hence, sum of 692 + 147 = 839.

Question 4.
553 + 250 = ?

GIVEN:
553 + 250 = ???

553 + 250 =  803.
Hence, Sum of 553 + 250 =  803.

Think and Grow: Modeling Real Life

Your school wants to collect 750 canned goods. Your school collects 432 cans of soup and386 cans of vegetables. Does your school reach the goal? Explain.
Models:

Yes No
____________________
____________________
Number of canned goods school wants to collect   = 750
Number of cans of soup school collected =  432
Number of cans of vegetables school collected = 386
Total number of cans of soup and cans of vegetables school collected
= 432 + 386 = 818.

SUBTRACTION:
Number of canned goods school wants to collect  –  Total number of cans of soup and cans of vegetables school collected
= 818 – 750
= 68.
Yes, school reached its goal by 68 more than its wanted goods.

Show and Grow

Question 5.
A charity needs 600 volunteers. 328 people sign up on Saturday and 219 people sign up on Sunday. Are there enough volunteers? Explain.

Yes No
______________________
______________________
GIVEN:
Total number of volunteers in a charity = 600
Number of people signed up on Saturday = 328
Number of people signed up on Sunday = 219
Total number of people signed up on  Saturday and Sunday = 328 + 219 = 547.
NO, there are not enough volunteers because:
SUBTRACTION:
Total number of volunteers in a charity – Total number of people signed up on  Saturday and Sunday
= 600 – 547
= 53.
Hence, no there are not enough because 53 more people are required to sign up into the charity.

### Use Models to Add Three-Digit Numbers Homework & Practice 9.6

Question 1.
614 + 250 = ?

GIVEN:
614 + 250 = ???

614 + 250 = 864.
Hence, 614 + 250 = 864.

Question 2.
192 + 717 = ?

GIVEN:
192 + 717 = ???

192 + 717 = ???
Hence, Sum of 192 + 717 = 909.

Question 3.
Open-Ended
Complete the addition problem so that you need to regroup to add.

GIVEN:
235 + 32? = ???

253 + 325 = 578.
REGROUPING OF NUMBERS:
Add 7 to 235.
Subtract 7 from 325.
253    +     325
+  7           –   7
260    +     318 = 578.
Hence, Sum of 253 + 325 = 578.

Question 4.
Modeling Real Life
The cafeteria needs 700 trays. They have 312 brown trays and 342 orange trays. Does the cafeteria have enough trays? Explain.
Yes No
_____________________________
_____________________________
GIVEN:
Total number of trays cafeteria needs = 700
Number of brown trays cafeteria has = 312
Number of  orange trays cafeteria has = 342
Total  number of brown and orange trays cafeteria has = 312 + 342 = 654
SUBTRACTION:
Total number of trays cafeteria needs – Total  number of brown and orange trays cafeteria has
= 700 – 654
= 46.
Hence, there are no enough trays in the cafeteria.46 more trays the cafeteria needs.

Review & Refresh

Draw to show the time.
Question 5.

Question 6.

### Lesson 9.7 Add Three-Digit Numbers

Explore and Grow

Find each sum.

GIVEN:
445 + 254 = ???
253 + 318 = ???
627 + 194 =???

445 + 254 = 699
253 + 318 =  571
627 + 194 = 821
Hence, Sum of 445 + 254 = 699
253 + 318 =  571
627 + 194 = 821.

Compare the problems. How are they the same? How are they different?
_________________________
_________________________
They are same with the process of adding and they are different in the results.

Show and Grow

Question 1.

GIVEN:
184+438 = ???

Hence, sum of 184+438 = 622.

Question 2.

GIVEN:
227 + 267 = ???

Hence, Sum of 227 + 267 = 494.

Question 3.

GIVEN:
421 + 354 = ???

Hence, Sum of 421 + 354 = 775.

Question 4.

GIVEN:
279 + 514 = ???

Hence, Sum of 279 + 514 = 793.

Question 5.

GIVEN:
313 + 288 = ???

Hence, Sum of 313 + 288 = 601.

Question 6.

GIVEN:
396 + 156 = ???

Hence, Sum of 396 + 156 = 552.

Question 7.

GIVEN:
659 + 258 = ???

Hence, Sum of 659 + 258 = 917.

Question 8.

GIVEN:
463 + 485 = ???

Hence, Sum of 463 + 485 = 948.

Question 9.

GIVEN:
298 + 378 = ???

Hence, Sum of 298 + 378 = 676.

Apply and Grow: Practice

Question 10.

GIVEN:
245 + 605 = ???

245 + 605 = 810
Hence, Sum of 245 + 605 = 810.

Question 11.

GIVEN:
450 + 291 = ???

450 + 291 = 741.
Hence, Sum of 450 + 291 = 741.

Question 12.

GIVEN:
198 + 527 = ???

198 + 527 = 725.
Hence, Sum of 198 + 527 = 725.

Question 13.

GIVEN:
742 + 116 = ???

742 + 116 = 858.
Hence, Sum of 742 + 116 = 858.

Question 14.

GIVEN:
537 + 176 = ???

537 + 176 = 713.
Hence, Sum of 537 + 176 = 713.

Question 15.

GIVEN:
382 + 351 = ???

382 + 351 = 733.
Hence, Sum of 382 + 351 = 733.

Question 16.

GIVEN:
463 + 194 = ???

463 + 194 = 657.
Hence, Sum of 463 + 194 = 657.

Question 17.

GIVEN:
186 + 567 = ???

186 + 567 = 753.
Hence, Sum of 186 + 567 = 753.

Question 18.

GIVEN:
623 + 298 = ???

623 + 298 = 921.
Hence, Sum of 623 + 298 = 921.

Question 19.
DIG DEEPER!
Find the missing digits

GIVEN:
462 + ___43 = 705.
SUBTRACTION:
=> 705 – 462 = 243.

1___7 + 115 = 252.
SUBTRACTION:
=> 252 – 115 = 137.

395 + 14___ = 540.
SUBTRACTION:
=> 540 – 395 = 145.

Hence, Sum of  462 + 343 = 705.
147 + 115 = 252.
395 + 145 = 540.

Think and Grow: Modeling Real Life

A puzzle has 540 pieces. You put 254 pieces together. Your friend puts 286 pieces together. Did you and your friend use all of the pieces?

Yes         No
Total number of pieces the puzzles has = 540
Number of pieces kept together by me = 254
Number of pieces kept together by my Friend = 286
Total number of pieces kept together = Number of pieces kept together by me + Number of pieces kept together by my Friend
= 254 + 286
= 540.
Hence, my friend and me used all the pieces of puzzle.
Yes ,its a addition equation.

Show and Grow

Question 20.
A sticker book has 800 stickers. You use 413 of them. Your friend uses 377. Did you and your friend use all of the stickers?

Yes No
Total number of stickers a sticker book has = 800
Number of stickers used by me =413
Number of stickers used by my Friend = 377
Total number of stickers used = Total number of stickers used by me and my Friend
= 413 + 377 = 790.
Number of stickers remaining = Total number of stickers a sticker book has – Total number of stickers used by me and my Friend
= 800 -790
= 10.
Number of stickers remaining = 10.
Hence, NO we did not use all stickers. There are 10 more stickers to be used.

Question 21.
A bus has 850 miles to travel. How many miles does the bus have left to travel?

______ miles
Total number of miles the bus travels = 850
Number of miles bus travelled on day 1 = 423
Number of miles bus travelled on day 2 = 417
Number of miles bus travelled on day 1 and day 2 = 423 + 417 = 840.
DIFFERENCE:
Number of miles left out for the bus to travel =Total number of miles the bus travels – Number of miles bus travelled on day 1 and day 2
= 850 – 840
= 10.
Hence, Number of miles left out for the bus to travel =10.

### Add Three-Digit Numbers Homework & Practice 9.7

Question 1.

GIVEN:
341 + 278 = ???

Hence, Sum of 341 + 278 = 619.

Question 2.

GIVEN:
705 + 126 = ???

Hence, Sum of 705 + 126 = 831.

Question 3.

GIVEN:
582 + 249 = ???

Hence, Sum of  582 + 249 = 831.

Question 4.

GIVEN:
573 + 338 = ???

Hence, Sum of 573 + 338 = 911.

Question 5.

GIVEN:
264 + 310 = ???

Hence, Sum of 264 + 310 = = 574.

Question 6.

GIVEN:
516 + 156 = ???

Hence, Sum of 516 + 156 = 672.

Question 7.

GIVEN:
490 + 137 = ???

Hence, Sum of 490 + 137 = 627.

Question 8.

GIVEN:
625 + 297 = ???

Hence, Sum of 625 + 297 = = 922.

Question 9.

GIVEN:
364 + 386 = ???

Hence, Sum of 364 + 386 = 750.

Question 10.
Open-Ended
Complete the addition problem so that you do not need to regroup to add.

GIVEN:
256 + 3____3 = ???

Missing number = 4
256 + 343 = 599.
Hence, Sum of 256 + 343 = 599.

Question 11.
Modeling Real Life
The art room has 645 markers. One class is using 312 markers. Another class is using 209. Are both classes using all the markers?

Yes No
GIVEN:
Number of Markers art room has = 645
Number of markers one class using = 312
Number of markers another class using = 209
Total Number of markers used by one class and another class = 312 + 209 = 521
SUBTRACTION:
Number of markers unused = Number of Markers art room has – Total Number of markers used by one class and another class
= 645 – 521
= 124.
Hence, Number of markers unused = 124.
NO, all markers are not used.

Question 12.
Modeling Real Life
340 water balloons need to be filled. You fill 122 and your friend fills 145. How many more water balloons need to be filled?

____ water balloons
GIVEN:
Number of balloons needed to be filled = 340
Number of balloons filled by me = 122
Number of balloons filled by my friend = 145
Total Number of balloons filled by me and my friend = 122 + 145 =  267.
SUBTRACTION:
Number of balloons more to be filled = Number of balloons needed to be filled – Total Number of balloons filled by me and my friend
= 340 – 267
= 73.
Hence, Number of balloons more to be filled = 73.

Review & Refresh

Use place value to find the missing numbers.
Question 13.
324, 325, ____, 327, _____, _____, ______
GIVEN:
324, 325, ____, 327, _____, _____, ______
SUBTRACTION:
=> 325 – 324 = 1  (PLACE VALUE)
325 + 1 = 326
327 + 1 = 328
328 + 1 = 329
329 + 1 = 330
Hence, the missing number sequence =324, 325, 326, 327, 328, 329, 330.

Question 14.
463, 473, ____, 493, ____, _____, ______
GIVEN:
463, 473, ____, 493, ____, _____, ______
SUBTRACTION:
=> 473- 463 = 10(PLACE VALUE)
463 + 10 = 473
473 + 10 = 483
483 + 10 = 493
493 + 10 = 503
503 + 10 = 513
513 + 10 = 523
Hence, the missing number sequence = 463, 473, 483, 493, 503, 513, 523.

### Lesson 9.8 Add Up to 4 Two-Digit Numbers

Explore and Grow

Use any strategy to solve.
Newton has 19 red balloons, 23 green balloons,31 yellow balloons, and 17 blue balloons. How many balloons does he have in all?
_____ balloons
GIVEN:
Number of red balloons Newton has = 19
Number of green balloons Newton has = 23
Number of yellow balloons Newton has = 31
Number of blue balloons Newton has = 17
Total number of balloons Newton has = Number of red balloons Newton has + Number of green balloons Newton has + Number of yellow balloons Newton has  + Number of blue balloons Newton has
= 19 + 23 + 31 + 17
= 42 + 31 + 17
= 73 + 17
= 90.
Hence, Total number of balloons Newton has = 90.

Compare your strategy to your partner’s strategy. How are your strategies the same? How are they different?
______________________
_______________________
Strategy of mine and my friends are different yet the process to calculate the sum of the numbers is same.

Show and Grow

Question 1.

GIVEN:
26 + 88 + 32 = ???
26 + 88 + 32
= 114 + 32
= 146.
Hence, Sum of 26 + 88 + 32 = 146.

Question 2.

GIVEN:
60 + 15 + 55 = ???
60 + 15 + 55
= 75 + 55
= 130.
Hence, Sum of 60 + 15 + 55 = 130.

Question 3.

GIVEN:
77 + 96 +24 = ???
77 + 96 +24
= 173 + 24
= 197.
Hence, Sum of 77 + 96 +24 = 197.

Question 4.

GIVEN:
57 + 13 + 33+ 48 = ???
57 + 13 + 33+ 48
= 70 + 33+ 48
= 103 + 48
= 151.
Hence, Sum of 57 + 13 + 33+ 48 = 151.

Question 5.

GIVEN:
89 + 62 +10 + 51 = ???
89 + 62 +10 + 51
= 151 + 10 + 51
= 161 + 51
= 212.
Hence, Sum of 89 + 62 +10 + 51 = 212.

Question 6.

GIVEN:
95 + 71 + 46 + 53 = ???
95 + 71 + 46 + 53
= 166 + 46 + 53
= 212 + 53
= 265.
Hence, Sum of 95 + 71 + 46 + 53 = 265.

Apply and Grow: Practice

Question 7.

GIVEN:
17 + 84 + 23 = ???
17 + 84 + 23
= 101 + 23
= 124.
Hence, Sum of 17 + 84 + 23 = 124.

Question 8.

GIVEN:
21 + 42 + 39 = ???
21 + 42 + 39
= 63 + 39
= 102.
Hence, Sum of 21 + 42 + 39 = 102.

Question 9.

GIVEN:
92 + 58 + 19 = ???
92 + 58 + 19
= 150 + 19
= 169.
Hence, Sum of 92 + 58 + 19 = 169.

Question 10.

GIVEN:
58 + 12 + 6 + 24 = ???
58 + 12 + 6 + 24
= 70 + 6 + 24
= 76 + 24
= 100.
Hence, Sum of 58 + 12 + 6 + 24 = 100.

Question 11.

GIVEN:
42 + 26 + 33 + 14 = ???
42 + 26 + 33 + 14
= 68 + 33 + 14
= 101 + 14
= 115.
Hence, Sum of 42 + 26 + 33 + 14 = 115.

Question 12.

GIVEN:
13 + 52 + 37 + 48 = ???
13 + 52 + 37 + 48
= 65 + 37 + 48
= 102 + 48
= 150.
Hence, Sum of 13 + 52 + 37 + 48 = 150.

Question 13.

GIVEN:
64 + 20 + 35 + 56 = ???
64 + 20 + 35 + 56
= 84 + 35 + 56
=  119 + 56
= 175.
Hence, Sum of 64 + 20 + 35 + 56 = 175.

Question 14.

GIVEN:
36 + 92 + 40 + 15 = ???
36 + 92 + 40 + 15
= 128 + 40 + 15
= 168 + 15
= 183.
Hence, Sum of 36 + 92 + 40 + 15 = 183.

Question 15.

GIVEN:
19 +  3 + 47 + 25 = ???
19 +  3 + 47 + 25
= 22 + 47 + 25
= 69 + 25
= 94.
Hence, Sum of  19 + 3 + 47 + 25 = 94.

Question 16.
Number Sense
Solve. Which two digits in the ones place did you add first? Explain.
7 + 15 + 36 + 25 = _______
______________________
______________________
GIVEN:
7 + 15 + 36 + 25 = ???
The two digits in ones place added first are 5 number.
= 15 + 25 + 36 + 7
= 40 + 36 + 7
= 76 + 7
= 83.
Hence, Sum of 7 + 15 + 36 + 25  = 83.

Think and Grow: Modeling Real Life

How many seeds does your class plant in all?

_____ seeds
GIVEN:
Number of Sunflower plant seeds = 81
Number of Marigold plant seeds = 92
Number of Pumpkin plant seeds = 83
Number of Tomato plant seeds = 78
Total number of plants seeds = Number of Sunflower plant seeds + Number of Marigold plant seeds + Number of Pumpkin plant seeds + Number of Tomato plant seeds
= 81 + 92 + 83 + 78
= 173 + 83 + 78
= 256 + 78
= 334.
Hence, the total number of plants seeds = 334.

Show and Grow

Question 17.
How many fish are there in all?

GIVEN:
Number of Angelfish = 43
Number of Rainbow fish = 37
Number of Swordtail = 29
Number of Tetra = 59
Total Number of all fishes = Number of Angelfish + Number of Rainbow fish + Number of Swordtail + Number of Tetra
= 43 + 37 + 29 + 59
= 80 + 29 + 59
= 109 + 59
= 168.
Hence, Total Number of all fishes = 168.

Question 18.
DIG DEEPER!
You need 100 craft sticks for a project. You have a 24-pack, a 32-pack, and a 36-pack. How many more craft sticks do you need?
______ more craft sticks
GIVEN:
Number of craft sticks needed for a project = 100
Number of packs in first pack = 24
Number of packs in second pack = 32
Number of packs in third pack = 36
Total number of packs in all three packs = Number of packs in first pack + Number of packs in second pack + Number of packs in third pack = 24 + 32 + 36 = 92.
SUBTRACTION:
Number of stickers needed = Number of craft sticks needed for a project – Total number of packs in all three packs
= 100 – 92
=8.
Hence, Number of stickers needed = 8.

### Add Up to 4 Two-Digit Numbers Homework & Practice 9.8

Question 1.

GIVEN:
43 + 62 + 18 =???
43 + 62 + 18
=105 + 18
= 123.
Hence, Sum of 43 + 62 + 18 = 123.

Question 2.

GIVEN:
74 + 30 +69 = ???
74 + 30 +69
= 104 + 69
= 173.
Hence, Sum of 74 + 30 +69 = 173.

Question 3.

GIVEN:
34 + 57 + 27 = ???
34 + 57 + 27
= 91 + 27
= 118.
Hence, Sum of 34 + 57 + 27 = 118.

Question 4.

GIVEN:
51 + 16 + 6 + 24 = ???
51 + 16 + 6 + 24
= 67 + 6 + 24
= 73 + 24
= 97.
Hence, Sum of 51 + 16 + 6 + 24 = 97.

Question 5.

GIVEN:
84 + 62 + 10 + 31 = ???
84 + 62 + 10 + 31
= 146 + 10 + 31
= 156 + 31
= 187.
Hence, Sum of 84 + 62 + 10 + 31 = 187.

Question 6.

GIVEN:
66 + 49 + 34 +21 = ???
66 + 49 + 34 +21
= 115 + 34 + 21
= 149 + 21
= 170.
Hence, Sum of 66 + 49 + 34 +21 = 170.

Question 7.

GIVEN:
50 + 26 + 45 + 44 = ???
50 + 26 + 45 + 44
= 76 + 45 + 44
= 121 + 44
= 165.
Hence, Sum of 50 + 26 + 45 + 44 = 165.

Question 8.

GIVEN:
73 + 14 + 26 + 27 = ???
73 + 14 + 26 + 27
= 87 + 26 + 27
= 113 + 27
= 140.
Hence, Sum of 73 + 14 + 26 + 27 = 140.

Question 9.

GIVEN:
65 + 8 + 32 + 71 = ???
65 + 8 + 32 + 71
= 73 + 32 + 71
= 105 + 71
= 176.
Hence, Sum of 65 + 8 + 32 + 71 = 176.

Question 10.
Number Sense
Find the missing number.

GIVEN:
38 + 41 + ____ + 52 = 159.
Let the missing number be X.
38 + 41 + X + 52 = 159
=> 79 + X + 52 = 159
=> X + 131 = 159
=> X = 159 – 131
=> X = 28.
EQUATION:
38 + 41 + 28 + 52 = 159.
Hence, missing number = 28.

Question 11.
Modeling Real Life
How many sandwiches are there in all?

______ sandwiches
GIVEN:
Number of Turkey Sandwiches = 59
Number of Ham Sandwiches = 23
Number of Cheese Sandwiches = 35
Number of Peanut Butter Sandwiches = 45
Total number of all sandwiches = Number of Turkey Sandwiches + Number of Ham Sandwiches + Number of Cheese Sandwiches + Number of Peanut Butter Sandwiches
= 59 + 23 +35 + 45
= 162.
Hence, the total number of all sandwiches = 162.

Question 12.
DIG DEEPER!
You need 210 votes to win a school election. You receive 67 votes from the first grade and 93 votes from the second grade. How many more votes do you need?
Number of votes required to win school election = 210
Total number of votes received from first and second grade = 67 + 93 = 160
SUBTRACTION:
Number of votes required to win the election = Number of votes required to win school election – Total number of votes received from first and second grade
= 210 – 160 = 50.
Hence, Number of votes required to win the election =  50.

Review & Refresh

Write a number that makes the statement true.
Question 13.
865 < _____
GIVEN:
865 < _____.
Hence, 865 < 900.

Question 14. _____ > 374
GIVEN: _____ > 374
Hence,  415 > 374.

Question 15.
736 = ____
GIVEN:
736 = _____
Hence, 736 = 736.

Question 16.
451 > _____
GIVEN:
451 > ______
Hence, 451 > 389.

### Lesson 9.9 Explain Addition Strategies

Explore and Grow

Use two different strategies to find 274 + 519.

ONE WAY :COMPENSATION METHOD
274 + 519 = ???
Add 6 to 274.
Subtract 6 from 519.
274     +     519
+  6             –   6
280     +     513  = 793.
Hence, Sum of 274 + 519 = 793.
OTHER WAY: USE MODELS TO ADD

Hence, Sum of 274 + 519 = 793.
Explain why you chose one of your strategies.
_________________________
_________________________
I choose COMPENSATION METHOD and USE MODELS TO ADD for adding numbers because its easy to understand and easy to calculate the addition also.

Show and Grow

Choose any strategy to solve. Explain how you solved.
Question 1.
379 + 240 = ____
___________________
____________________
GIVEN:
379 + 240 = ???

Hence, Sum of 379 + 240 = 619.

Apply and Grow: Practice

Choose any strategy to solve. Explain how you solved.
Question 2.
426 + 355 = _____
___________________
___________________
GIVEN:
426 + 355 = ???

Hence, Sum of 426 + 355 = 781.

Question 3.
671 + 219 = _____
____________________
____________________
GIVEN:
671 + 219 = ???

Hence, Sum of 671 + 219 = 890.

Question 4.
YOU BE THE TEACHER
Your friend uses compensation to solve. Is your friend correct? Explain.

____________________
____________________
GIVEN:
182 + 506 = 688
182     +    506
+6               -6
188     +    500 = 688
Hence, my friend compensation is correct because sum of 182 + 506 = 688.

Think and Grow: Modeling Real Life

Choose any strategy to solve. Explain how you solved.
You have 567 pennies in a piggy bank and 428 in a jar. How many pennies do you have in all?

______ pennies
_______________________
_______________________
GIVEN:
Number of pennies in  piggy bank = 567
Number of pennies in a jar = 428
Total number of pennies in piggy bank and a jar = Number of pennies in  piggy bank  + Number of pennies in a jar
= 567 + 428 =  995.
Hence, the total number of pennies in piggy bank and a jar = 995.

Show and Grow

Choose any strategy to solve. Explain how you solved.
Question 5.
A beekeeper has 494 worker bees and 376 drone bees. How many bees does he have in all?

______ bees
___________________
___________________
GIVEN:
Number of worker bees a beekeeper has = 494
Number of drone bees a beekeeper has = 376
Total number of worker bees and drone bees  a beekeeper has = 494 + 376 = 870
Hence, the total number of worker bees and drone bees a beekeeper has = 870.

Question 6.
There are 365 days in one year. How many days are there in two years?
______ days
______________________
______________________
CONVERTION:
1 YEAR = 365 DAYS
2 YEARS =????
MULTIPLICATION:
=> 2 x 365 = 730 days.
Hence, Number of days in 2 years = 730.

### Explain Addition Strategies Homework & Practice 9.9

Choose any strategy to solve. Explain how you solved.
Question 1.
656 + 181 = _____
_________________________
_________________________
GIVEN:
656 + 181 = ???

Hence, Sum of 656 + 181 = 837.

Question 2.
567 + 348 = ______
______________________
______________________

Hence, Sum of 567 + 348 =915.

Question 3.
DIG DEEPER!
Find the missing numbers.

SUBTRACTION:
765 – 541 = 224
870 – 358 = 512
542 – 108 = 434

Hence, 541 + 224 = 765
358 + 512 = 870
108 + 434 = 542.

Choose any strategy to solve. Explain how you solved.
Question 4.
Modeling Real Life
A farmer has 415 tomato plants and 250 pepper plants. How many plants does he have in all?

_____ plants
___________________
___________________
Number of tomatoes plants farmer has = 415
Number of pepper plants farmer has = 250
Total number of tomatoes plants and pepper plants farmer has = 415 + 250 = 665
Hence , the total number of tomatoes plants and pepper plants farmer has = 665.

Question 5.
Modeling Real Life
You practice the trumpet for 45 minutes each day. How many minutes do you practice in 4 days?
______ minutes
_________________________
________________________
GIVEN:
Practice time of the trumpet each day = 45 minutes
Practice time of the trumpet in 4 days= ???
MULTIPLICATION:
=> 4 x 45 = 180 minutes.
Hence, Practice time of the trumpet in 4 days=  180 minutes.

Review & Refresh

Question 6.
97 − 71 = _____
GIVEN:
97 – 71 = ???
DIFFERENCE:
97 – 71 =26.
Hence, 97 – 71 =26.

Question 7.
56 − 14 = _____
GIVEN:
56 – 14 = ???
DIFFERENCE:
56 – 14 = 42
Hence, 56 – 14 = 42.

### Add Numbers within 1,000 Performance Task

A store has four different robot kits.

Question 1.
How many parts are there in the green, purple, and orange kits?
______ parts
GIVEN:
FOUR different robot kits.
Number of robot parts in green kit = 280
Number of robot parts in purple kit = 157
Number of robot parts in orange kit = 360
Total number of robot parts in green, purple, and orange kits = 280 + 157 + 360
= 437 + 360 = 797.
Hence, Total number of robot parts in green, purple, and orange kits = 797.

Question 2.
The orange kit has 183 fewer parts than the yellow kit. How many parts are in the yellow kit?
______ parts
Let robot parts in yellow kit be X
Number of robot parts in orange kit = 183
Difference in Number of robot parts in orange and yellow kit = 360
= X – 183 = 360
=> X = 360 + 183
=> X = 543.
Hence, robot parts in yellow kit = 543.
Question 3.
Your friend wants to buy two kits so that he has700 parts. Which two kits should he buy?
_____ and ______
GIVEN:
Your friend wants to buy two kits so that he has700 parts.
Number of robot parts in green kit = 280
Number of robot parts in purple kit = 157
Number of robot parts in orange kit = 360
Number of robot parts in yellow kit = 543
Check the sum of four kits robot parts to each other.
280 + 157 = 437                     157 + 280 = 437
280 + 360 = 640                     157 + 360 = 517
280 + 543 = 823                     157 + 543 = 700

360+ 280 = 640
360 + 157 = 517
360 + 543 = 903
Therefore, 157 + 543 = 700.
Two kits that have to be purchased = Number of robot parts in purple kit +  Number of robot parts in yellow kit =157 + 543 = 700.
Hence, Two kits that have to be purchased =700.

Question 4.
a. You have some robot parts at home. You buy two purple kits and one orange kit. Now you have 774 parts. How many parts did you have to start?
_______ parts
GIVEN:
Number of robot parts in purple kit = 157
Two purple kit  robot parts total = 2 x 157 = 314
Number of robot parts in orange kit = 360
Total parts in Two purple kit and orange kit = 314 + 360 = 674
Total number of robot parts had= 774
DIFFERENCE:
Number of robot parts required to start =  Total number of robot parts had – Total robot parts in Two purple kit and orange kit
= 774 – 674
= 100
Hence, Number of robot parts required to start are 100 more.

b. Your cousin has 450 robot parts at home. She buys a kit and now has 36 more parts than you. Which kit did she buy?
______ kit
GIVEN:
Number of robot parts my cousin has = 450
Number of robot parts me having = 674
Number of robot parts she has more than me = 36
=> 674 + 36 = 710
Checking the sum of kits with my friends kit
=> 450 + 280 =730
450 + 157 = 607
450 + 360 = 810
450 + 543 = 993
CONDITION GIVEN:
She buys a kit and now has 36 more parts than you.
=> 450 + 280 = 730.
Hence, Kit my friend purchased is green kit.

### Add Numbers within 1,000 Activity

Three in a Row: Three-Digit Addition
To Play: Players take turns. On your turn, spin both spinners. Add the two numbers and cover the sum. Continue playing until someone gets three in a row.

### Add Numbers within 1,000 Chapter Practice

9.1 Add 10and 100

Question 1.
230 + 10 = _____
GIVEN:
230 + 10 = ???
230 + 10 = 240.
Hence, Sum of 230 + 10 = 240.

Question 2.
419 + 10 = _____
GIVEN:
419 + 10 = ???
419 + 10 = 429.
Hence, Sum of 419 + 10 = 429.

Question 3.
623 + 100 = _____
GIVEN:
623 + 100 = ???
623 + 100 = 723.
Hence, Sum of 623 + 100 = 723.

Question 4.
899 + 10 = _____
GIVEN:
899 + 10 = ???
899 + 10 = 999.
Hence, Sum of 899 + 10 = 999.

Question 5.
384 + 100 = _____
GIVEN:
384 + 100 = ???
384 + 100 = 484.
Hence, sum of 384 + 100 = 484.

Question 6.
167 + 100 = _____
GIVEN:
167 + 100 = ???
167 + 100 = 267.
Hence, sum of 167 + 100 = 267.

9.2 Use a Number Line to Add Hundreds and Tens

Question 7.
592 + 340 = _____

592 + 100 + 100 + 100 + 40
= 692 + 100 + 100 + 40
= 792 + 100 + 40
= 892 + 40
= 932.
Hence, Sum of 592 + 100 + 100 + 100 + 40 = 932.

Question 8.
Modeling Real Life
You have 170 football stickers and some baseball stickers. You have 360 stickers in all. How many baseball stickers do you have?

_______ baseball stickers
GIVEN:
Total number of stickers in all = 360
Number of football stickers = 170
Number of baseball stickers = ???
SUBTRACTION:
Number of baseball stickers = Total number of stickers in all – Number of football stickers
= 360 – 170
= 130.
Hence, Number of baseball stickers = 130.

9.3 Use a Number Line to Add Three-Digit Numbers

Question 9.
365 + 342 = _____

365 +100 + 100 + 100 + 42
= 465 + 100 + 100 + 42
= 565 + 100 + 42
= 665 + 42
= 707.
Hence, 365 +100 + 100 + 100 + 42 = 707.

Question 10.
604 + 217 = ____

604 + 100 + 100 + 17
= 704 + 100 + 17
= 804 + 17
= 821.
Hence, Sum of 604 + 100 + 100 + 17 = 821.

9.4 Use Compensation to Add Three-Digit Numbers

Use Compensation to Add
Question 11.
205 + 631 = ?

_____ + ____ = _____
205 + 631 = ???
Add 5 to 205.
Subtract 5 from 631.
205   +    631
+   5          –  5
210     +   626 = 836.
Hence, Sum of 205 + 631 = 836.

Question 12.
452 + 311 = ?

_____ + ____ = _____
GIVEN:
452 + 311 = ???
Add 8 to 452.
Subtract 8 from 311.
452      +    311
+ 8             –   8
460      +    302 = 762.
Hence, Sum of 452 + 311 = 762.

Question 13.
YOU BE THE TEACHER
Newton uses compensation to find 198 + 267. Is he correct? Explain.

GIVEN:
198 + 267 = ???
Add 2 to 198.
Subtract 2 from 267.
198    +    267
+ 2           –  2
200    +   265 = 465.
Hence, Newton compensation is not correct because the sum of 198 + 267 = 465 not 467.

9.5 Use Partial Sums to Add Three-Digit Numbers

Question 14.

GIVEN: 264 + 483 =???

Hence, Sum of 264 + 483 = 747.

Question 15.

GIVEN:
807 + 123 = ??

Hence, Sum of 807 + 123 = 933.

Question 16.

GIVEN:
325 + 324 = ???

Hence, Sum of 325 + 324 = 649.

Question 17.

GIVEN:
640 + 293 = ???

Hence, Sum of 640 + 293 = 933.

9.6 Use Models to Add Three-Digit Numbers

Question 18.
395 + 410 = ?

GIVEN:
395 + 410 = ???

Hence, Sum of 395 + 410 = 805.

9.7 Add Three-Digit Numbers

Question 19.
Number Sense
Find the missing digits.

GIVEN:

SUBTRACTION:
918 – 561 = 357.
379 – 264 = 115.
792 – 646 = 146.

561 + 357 = 918.
115 + 264 = 379.
646 + 146 = 792.
Hence, the missing numbers are  357, 115 and 146.

9.8 Add Up to 4 Two-Digit Numbers

Question 20.

GIVEN:
54 + 32 + 20 = ???
54 + 32 + 20
= 86 + 20
= 106.
Hence, 54 +32 +20 = 106.

Question 21.

GIVEN:
43 + 58 +17 = ???
43 + 58 +17
= 101 + 17
=118.
Hence, 43 + 58 +17 = 118.

Question 22.

GIVEN:
16 + 81 + 74 = ???
16 + 81 + 74
= 97 + 74
= 151.
Hence, 16 +61 + 74 = 151.

Question 23.

GIVEN:
92 + 52+ 38 +41 = ???
92 + 52+ 38 +41
= 144 + 38 +41
= 182 + 41
= 223.
Hence, 92 + 52+ 38 +41 = 223.

Question 24.

GIVEN:
90+ 5 +13 + 48 = ???
66 + 44 +30 +9
= 95 + 13 + 48
= 108 + 48
= 156.
Hence, 90+ 5 +13 + 48 = 156.

Question 25.

GIVEN:
66 + 44 +30 +9 = ???
66 + 44 +30 +9
= 110+30 +9
= 140 + 9
= 149.
Hence, 66 + 44 +30 +9 = 149.

9.9 Explain Addition Strategies

Choose any strategy to solve. Explain how you solved.
Question 26.
538 + 176 = ______
________________________
_________________________
EQUATION METHOD:
538 + 100 + 10 + 10 +10 + 10  + 10 + 10 + 10 + 6
=638 + 10 + 10 +10 + 10  + 10 + 10 + 10 + 6
= 648 + 10 +10 + 10  + 10 + 10 + 10 + 6
= 658 + 10 + 10  + 10 + 10 + 10 + 6
= 668 + 10  + 10 + 10 + 10 + 6
= 678 + 10 + 10 + 10 + 6
= 688 + 10 + 10 + 6
= 698 + 10 + 6
= 708 +6
= 714.

Conclusion:

We have given a detailed explanation for each and every topic discussed in Big Ideas Math Book Grade 2 Chapter 9 Add Numbers within 1,000 Solutions. We have also provided the exercise problems along with the answers to help in practising the Add Numbers within 1,000 chapter. Stay tuned to our website to get the answers for all chapters of grade 2.

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