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## Big Ideas Math Book 2nd Grade Answer Key Chapter 7 Understand Place Value to 1,000

The list of concepts covered in Big Ideas Math Book 2nd Grade 7th Chapter Understand Place Value to 1,000 is given in the below section. It is one of the important concepts that must be learned at the elementary. So, no student is supposed to skip this chapter. Download BIM Grade 2 Chapter 7 Understand Place Value to 1,000 PDF for free of cost and start preparation.

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**Vocabulary**

**Lesson: 1 Hundreds**

**Lesson: 2 Model Numbers to 1,000**

**Lesson: 3 Understand Place Value**

**Lesson: 4 Write Three-Digit Numbers**

**Lesson: 5 Represent Numbers in Different Ways**

- Lesson 7.5 Represent Numbers in Different Ways
- Represent Numbers in Different Ways Homework & Practice 7.5

**Understand Place Value to 1,000**

### Understand Place Value to 1,000 Vocabulary

**Organize It**

Use the review words to complete the graphic organizer.

Answer:

Explanation:

Tens Place: The first digit on the right of the decimal point means tenths.

Ones Place The ones place is just to the left of the decimal point.

**Define It**

Use your vocabulary cards to identify the word.

Answer:

### Lesson 7.1 Hundreds

**Explore and Grow
**How many unit cubes and rods are in a flat?

Answer: 100 cubes and 10 rods

Explanation

Given that, For counting cubes, should count all the rows and columns. By counting all the boxes there are

10 rows and 10 columns= 100 cubes To find out the rods count only the columns, by counting columns there are 10 rods.

**Show and Grow**

**Write how many tens. Circle groups of 10 tens. Write how many hundreds. Then write the number.**

Question 1.

______ tens

______ hundred

______

Answer: 20 tens & 2 hundred (200)

Explanation

Given that 20 tens are there by circling 10 tens

For counting tens, count columns and for counting hundreds count all the boxes.

Question 2.

______ tens

______ hundred

______

Answer: 40 tens & 4 hundred (400)

Explanation

Given that 40 tens are there by circling 10 tens

For counting tens, count columns and for counting hundreds count all the boxes.

**Apply and Grow: Practice**

**Write how many tens. Circle groups of 10 tens. Write how many hundreds. Then write the number.**

Question 3.

______ tens

______ hundred

______

Answer: 30 tens &Â 3 hundreds (300)

Explanation

Given that 30 tens are there by circling 10 tens

for counting tens, count columns and for counting hundreds count all the boxes.

Question 4.

______ tens

______ hundred

______

Answer: 60 tens & 6 hundreds

Explanation

Given that 60 tens are there by circling 10 tens.

for counting tens, count columns and for counting hundreds count all the boxes.

Question 5.

**DIG DEEPER!**

How many hundreds are in 700? How many tens?

_____ hundreds

______ tens

Answer: 7 hundreds are in 700 and 70 tens are in 700.

Explanation

there are 7 hundreds in 700 and 70 tens in 700. 10 tens givesÂ 1 hundreds totally there are 70 tens is 700.

Question 6.

You have 80 bags of crayons. There are 10 crayons in each bag. How many crayons do you have in all?

_____ crayons

Answer: 800 crayons

Explanation

Given that, There are 80 bags of crayons each bags contains 10 crayons.10 x 80=800 ( 10 crayons in each bags x 80 totally bags = 800 )

Thus, There are 800 crayons do we have in all.

**Think and Grow: Modeling Real Life**

A store sells oranges in bags of 10. The store sells 500 oranges. How many bags do they sell?

Make a quick sketch:

_____ bags

Answer: 50 bags

Explanation

Given that, The store sells 500 oranges each bags contains 10 oranges.10 X 50 = 500Â (10 oranges in each bags x 50 bags = 500 oranges)

Thus, The store sell the 50 bags of oranges.

Question 7.

A store sells bottles of glitter glue in boxes of 10. The store sells 600 bottles. How many boxes do they sell?

_____ boxes

Answer:Â 60 boxes

Explanation

Given that, The store sells 600 bottles of glitter glue each boxes contains 10 glitter glue bottles.

10 X 60 = 600Â (10 bottle of glitter glue in each boxes x 60 boxes = 600 bottles of glitter glue)

Thus, The store sell the 60 boxes of glitter glue.

Question 8.

**DIG DEEPER!**

You have 10 packages of invitations. Each package has 10 invitations. You need 300 invitations. How many more packages do you need?

_____ more packages

Answer: 30 packages

Explanation

Given that, There are 10 packages of invitations each packages has 10 invitations you needed 300 invitations

10 x 30 = 300 (10 invitations ofÂ packages x 30 packages = 300 invitations)

Thus, 30 packages of invitations are needed.

### Hundreds Homework & Practice 7.1

**Write how many tens. Circle groups of 10 tens. Write how many hundreds. Then write the number.**

Question 1.

_____ tens

______ hundreds

______

Answer: 50 tens & 5 hundreds.

Explanation

Given that 50 tens are there by circling 10 tens

For counting tens, count columns and for counting hundreds count all the boxes.

Question 2.

_____ tens

______ hundreds

______

Answer: 80 tens & 8 hundreds

Explanation

Given that 80 tens are there by circling 10 tens

For counting tens, count columns and for counting hundreds count all the boxes.

Question 3.

**Which One Doesnâ€™t Belong?**

Which does not belong with the other three?

Answer: 70

Question 4.

**Modeling Real Life**

A class has 30 boxes of pencils. Each box has 10 pencils. The class needs 600 pencils. How many more boxes does the class need?

______ boxes

Answer: 30 boxes

Explanation

Given that, the class has 30 boxes of pencils each boxes contains 10 pencils. The class needs 600 pencils.

10 x 60 (30 +30)=600 **(**10 Pencils in each boxes X 60 boxes (30 boxes which you have + 30 boxes of pencils you need)= 600 pencils**)
**Thus, the class needs another 30 boxes.

Question 5.

**Modeling Real Life**

You have 10 packages of cards. Each package has 10 cards. You need 200 cards. How many more packages do you need?

______ more packages

Answer: 10 package

Explanation

Given that, 10 packages of cards each packages contains 10 cards, you need 200 cards

10 x 20= 200 **(**10 cards in each packages X 20 packages of cards (10 packages which you have+10 packages you needed) =200 cards**)
**Thus, you need another 10 packages of cards.

**Review & Refresh**

Question 6.

Answer: 99

Question 7.

Answer: 75

### Lesson 7.2 Model Numbers to 1,000

**Explore and Grow**

Model the number. Make a quick sketch to match.

Answer:

**Show and Grow**

Question 1.

______ hundreds, _______ tens, and ______ ones is ______.

Answer: 7 hundreds, 4 tens and 5 ones is 745

Explanation

There are 7 unit of cubes each unit of cubes contains 10 tens which gives 700(10 tens in one unit of cubes x 70 tens in the whole unit of cubes = 700)

and there are 4 rod each contains 10 cubes that gives 4 tens is 40 and plus the ones 5 is 745.

**Apply and Grow: Practice**

Question 2.

______ hundreds, _______ tens, and ______ ones is ______.

Answer: 4 hundreds, 6 tens and 3 ones is 463.

Explanation

There are 4 unit of cubes each unit of cubes contains 10 tens which gives 400(10 tens in one unit of cubes x 40 tens in the whole unit of cubes = 400)

and there are 6 rod each contains 10 cubes that gives 6 tens is 60 and plus the ones 3 is 463.

Question 3.

______ hundreds, _______ tens, and ______ ones is ______.

Answer: 6 hundreds, 0 tens and 9 ones is 609.

Explanation

There are 6 unit of cubes each unit of cubes contains 10 tens which gives 600(10 tens in one unit of cubes x 70 tens in the whole unit of cubes = 700)

The place valueÂ of 0 (0 x 10 tens = 0) and plus the ones 9 is 609.

Question 4.

______ hundreds, _______ tens, and ______ ones is ______.

Answer: 3 hundreds, 4 tens and 6 ones is 346.

Explanation

There are 3 unit of cubes each unit of cubes contains 10 tens which gives 300(10 tens in one unit of cubes x 30 tens in the whole unit of cubes = 300)

and there are 4 rod each contains 10 cubes that gives 4 tens is 40 and plus the ones 6 is 346.

Question 5.

**DIG DEEPER!**

What number is Newton thinking about?

Answer:58

**Think and Grow: Modeling Real Life**

You buy the markers shown. How many markers do you buy?

Write the missing numbers:

_______ hundreds, _______ tens, and ______ ones

_______ markers

Answer: 3 hundreds, 2 tens and 4 ones is 324 markers.

Explanation

The above images shows that 3 packs of 100 markers(100+100+100=300) 2 packs of 10 markers(10+10=20) with additional of 4 markers, that gives

(300+20+4=324)Totally 324 markers you buy.

**Show and Grow**

Question 6.

You buy the balloons shown. How many balloons do you buy?

______ balloons

Answer:Â 570 balloons

Explanation

The above images shows that 5 packs of 100 balloons(100+100+100+100+100= 500) 7 packs of 10 balloons(10+10+10+10+10+10+10=70),

that gives ( 500+70=570)Totally 570 balloons you buy.

### Model Numbers to 1,000 Homework & Practice 7.2

Question 1.

______ hundreds, _______ tens, and ______ ones is ______.

Answer: 4 hundreds,7 tens 2 ones is 472

Explanation

There are 4 unit of cubes each unit of cubes contains 10 tens which gives 400(10 tens x 40 tens of whole cubes =400)

There are 7 rod gives you a 7 tens is 70 and plus 2 ones is 472.

Question 2.

______ hundreds, _______ tens, and ______ ones is ______.

Answer: 7 hundreds 4 tens 0 ones is 740.

Explanation

There are 7 unit of cubes each unit of cubes contains 10 tens which gives 700(10 tens in one unit of cubes x 70 tens in the whole unit of cubes = 700)

and there are 4 rod each contains 10 cubes that gives 4 tens is 40 and plus the ones place above picture there were no ones 0 is 740

Question 3.

______ hundreds, _______ tens, and ______ ones is ______.

Answer: 2 hundreds 8 tens and 6 ones is 286.

Explanation

There are 2 unit of cubes each unit of cubes contains 10 tens which gives you 200 (10 tens in one unit of cubes x 20 tens in the whole unit of cubes = 200) and there are 8 rod each contains 10 cubes that gives 8 tens is 80 and plus the ones 6 is 286.

Question 4.

**YOU BE THE TEACHER**

Your friend writes 8 hundreds and 3 ones as 83. Is your friend correct? Explain.

_________________________

_________________________

Answer:Â No, 8 is tens and 3 is ones as 83.

Explanation

The first digit is the tens place it tells you that there are 8 tens in the number 83. The next digit is the ones place which is 3.

Therefore there are 8 sets of 10 tens and plus 3 ones in the number 83.

Question 5.

**Modeling Real Life**

You buy the stickers shown. How many stickers do you buy?

______ stickers

Answer: 620 stickers

Explanation

Given that, There are 6 packs of stickers each contains 100 stickers that is (100+100+100+100+100+100=600

and 2 packs of stickers each contains 10 stickers that is (10+10= 20) Therefore 600 +20= 620

Thus, 620 sticker you buy.

**Review & Refresh**

Question 6.

Answer: 82

Question 7.

Answer: 83

Question 8.

Answer: 71

### Lesson 7.3 Understand Place Value

**Explore and Grow**

Make quick sketches to model each number.

What do you notice about the numbers?

_________________________

_________________________

Answer:

**Show and Grow**

Circle the value of the underlined digit.

Question 1.

483

300

30

3

Answer: 3

Explanation

Given that there are 3 digit number which is 483. A number can have many digits and each

digit has a special place and value. the 8 is in ones place and its place value is 8.

Question 2.

791

9 hundreds

9 tens

9 ones

Answer: 9 tens

Explanation

Given that there are 3 digit number which is 791. A number can have many digits and each

digit has a special place and value. the second digit at tens place. The 9 is in tens place value is 90.

Question 3.

612

6

60

600

Answer: 600

Explanation

Given that there are 3 digit number which is 612. A number can have many digits and each

digit has a special place and value. the first digit at hundreds place. The 6 is in hundreds place value is 600.

Question 4.

578

7 hundreds

7 tens

7 ones

Answer: 7 tens

Explanation

Given that there are 3 digit number which is 578. A number can have many digits and each

digit has a special place and value. the second digit at tens place. The 7 is in tens place value is 70.

**Apply and Grow: Practice**

**Circle the value of the underlined digit.**

Question 5.

354

300

30

3

Answer: 300

Explanation

Given that there are 3 digit number which is 354. A number can have many digits and each

digit has a special place and value. the first digit at hundreds place. The 3 is in hundreds place value is 300.

Question 6.

726

2 hundreds

2 tens

2 ones

Answer: 2 tens

Explanation

Given that there are 3 digit number which is 726. A number can have many digits and each

digit has a special place and value. the second digit at tens place. The 2 is in tens place value is 20.

Question 7.

594

4

40

400

Answer: 4

Explanation

Given that there are 3 digit number which is 594. A number can have many digits and each

digit has a special place and value. the 4 is in ones place and its place value is 4.

Question 8.

475

5 hundreds

50

5 ones

Answer: 5 ones

Explanation

Given that there are 3 digit number which is 475. A number can have many digits and each

digit has a special place and value. the 5 is in ones place and its place value is 5.

**Circle the values of the underlined digit.**

Question 9.

639

3 tens

300

30

Answer: 3 tens

Explanation

Given that there are 3 digit number which is 639. A number can have many digits and each

digit has a special place and value. the second digit at tens place. The 3 is in tens place value is 30.

Question 10.

872

8 hundreds

80

800

Answer: 8 hundreds

Explanation

Given that there are 3 digit number which is 872. A number can have many digits and each

digit has a special place and value. the first digit at hundreds place. The 8 is in hundreds place value is 800.

Question 11.

**Number Sense**

Write the number that has the following values.

The tens digit has a value of 40.

The ones digit has a value of 2.

The hundreds digit has a value of 600. ______

Answer: 642

Explanation

The combination of hundreds, tens, ones of 600, 40, 2 respectively.

**Think and Grow: Modeling Real Life**

How many points is one ball worth in each bucket?

Write the score:

______ hundreds, ______ tens, and _______ ones

Blue bucket: ______ points

Yellow bucket: _____ point

Red bucket: ______ points

Answer: Blue bucket 3 points,yellow bucket 4 points and red bucket 5 points

**Show and Grow**

Question 12.

How many points is one ring worth on each peg?

Green peg: ______ points

Blue peg: _______ point

Purple peg: ______ points

Answer:

Green peg: 1 points

Blue peg: 3 point

Purple peg: 2 points

### Understand Place Value Homework & Practice 7.3

**Circle the value of the underlined digit.**

Question 1.

523

500

50

5

Answer: 500

Explanation

Given that there are 3 digit number which is 523. A number can have many digits and each

digit has a special place and value. the first digit at hundreds place. The 5 is in hundreds place value is 500.

Question 2.

738

8 hundreds

8 ones

8 tens

Answer: 8 ones

Explanation

Given that there are 3 digit number which is 738. A number can have many digits and each

digit has a special place and value. the 8 is in ones place and its place value is 8.

Question 3.

364

60

6 ones

6 hundreds

Answer: 60

Explanation

Given that there are 3 digit number which is 364. A number can have many digits and each

digit has a special place and value. the second digit at tens place. The 6 is in tens place value is 60.

**Circle the values of the underlined digit.**

Question 4.

434

4

4 ones

4 hundreds

Answer: 4 ones

Explanation

Given that there are 3 digit number which is 434. A number can have many digits and each

digit has a special place and value. the 4 is in ones place and its place value is 4.

Question 5.

920

2

2 tens

20

Answer: 2 tens

Explanation

Given that there are 3 digit number which is 920. A number can have many digits and each

digit has a special place and value. the second digit at tens place. The 2 is in tens place value is 20.

Question 6.

**DIG DEEPER!**

Write the number that matches the clues.

The value of the hundreds digit is 800.

The value of the tens digit is 10 less than 70.

The value of the ones digit is an even number greater than 7.

_________

Answer:

i. 8

80

8

Question 7.

**Structure**

Write each number in the correct circle.

Answer:

Question 8.

**Modeling Real Life**

How many points is one ball worth in each hoop?

Blue hoop: ______ points

Orange hoop: _______ points

Red hoop: _______ point

Answer:

Blue hoop: 4 points

Orange hoop: 2 points

Red hoop: 5 points

**Review & Refresh**

Question 9.

Answer: 19

Question 10.

Answer: 42

Question 11.

Answer: 38

### Lesson 7.4 Write Three-Digit Numbers

**Explore and Grow**

Identify the value of the base ten blocks.

What is the total value of the base ten blocks? ________

How can you write the value of the base ten blocks as an equation?

Answer:

Standard Form is 246

Expanded Form is 200 + 40 + 6 = 246

Word Form is Two Hundred and Forty Six

**Show and Grow**

**Write the number in standard form, expanded form, and word form.**

Question 1.

Answer: Standard form 528,

Expanded form 500+20+8,

Word form Five Hundred Twenty Eight.

Question 2.

Answer: Standard form 709,

Expanded form 700+9,

Word form Seven Hundred Nine.

**Apply and Grow: PracticeÂ **

**Write the number in expanded form and word form.**

Question 3.

837

_____ + _____ + _____

______________

Answer: 800+30+7 and Eight hundred thirty seven

Explanation

In expanded form, write the number by showing the value of each digit (800+30+7)

In Word form write the number by using words but no numbers (Eight hundred thirty seven)

Question 4.

954

_____ + _____ + ______

_____________

Answer:900+50+4 and Nine hundred fifty four

Explanation

In expanded form, write the number by showing the value of each digit (900+50+4)

In Word form write the number by using words but no numbers ( Nine hundred fifty four)

**Write the number in standard form and word form.**

Question 5.

500 + 60

______

__________

Answer: 560 and Five hundred sixty

Explanation

In standard form, numbers are written using only numbers. There are no words (560)

In Word form write the number by using words but no numbers ( Nine hundred fifty four)

Question 6.

700 + 20 + 1

_____

____________

Answer:721 and Seven hundred twenty one

Explanation

In standard form, numbers are written using only numbers. There are no words (721)

In Word form write the number by using words but no numbers ( Seven hundred twenty one)

**Write the number in expanded form and standard form.**

Question 7.

six hundred seventy-four

_____ + ______ + ______

__________

Answer: 600+70+4 and 674

Explanation

In expanded form, write the number by showing the value of each digit (600+70+4)

In standard form, numbers are written using only numbers. There are no words (674)

Question 8.

four hundred seven

_____ + ______ + ______

__________

Answer: 400+7 and 407

Explanation

In expanded form, write the number by showing the value of each digit (400+7)

In standard form, numbers are written using only numbers. There are no words (407)

Question 9.

**Structure**

Which number did Newton model?

**Think and Grow: Modeling Real Life**

There are 819 pets in a pet store. 800 are fish. 9 are cats. The rest are birds. How many birds are there?

Expanded form:

_____ + _____ + ______

_____ birds

Answer: 10 birds are there and 800+10+9

Explanation

Given that, There are 819 pets in pets store

800 are fish, 9 are cats and restÂ are birds.

Thus,819 the right the first digit will be at ones place 9 is in ones place and its place value is 9 ,the second digit at tens place 1 is in tens place its place value is 10 and the third digit at hundreds place.8 is in hundreds place its place value is 800.

**Show and Grow**

Question 10.

There are 21

7 flowers at a flower stand. 200 are roses. 7 are sunflowers. The rest are tulips. How many tulips are there?

______ tulips

Answer: 10 are tulips in flower stand.

Explanation

Given that, There are 217 flowers in flowers stand

200 are roses, 7 are sunflowers and rest are tulips (200 – 7 = 10)

Thus,10 are the tulips.

Question 11.

There are 185 books at a book fair. 80 are chapter books. 5 are comic books. The rest are picture books. How many picture books are there?

______ picture books

Answer: 100 books are picture books.

Explanation

Given that, 185 books are at book fair.

80 books are chapter books and 5 are comic books and rest books are picture books

(80 – 5 = 100)

Thus, 100 books are picture books in book fair.

Question 12.

You sell 326 candles. You sell 6 small candles. You sell 20 medium candles. The rest are large candles. How many large candles did you sell?

______ large candles

Answer: 300 are large candles

Explanation:

Given that, 326 candles are sell by you,

6 are small candles and 20 are medium candles and rest are large candles

326-6(small candles)=320

320-20(medium candles)=300

Thus,300 large candles are you sell.

Three-Digit Numbers Homework & Practice 7.4

**Write the number in expanded form and word form.**

Question 1.

137

______ + _____ + _____

____________

Answer: 100+30+7 and One hundred thirty seven.

Explanation:

In expanded form, write the number by showing the value of each digit (100+30+7)

In Word form write the number by using words but no numbers ( One hundred twenty four)

Question 2.

280

_____ + _____ + ______

___________

Answer: 200+80 and Two hundred eighty

Explanation

In expanded form, write the number by showing the value of each digit (200+80)

In Word form write the number by using words but no numbers ( Two hundred eighty )

**Write the number in standard form and word form.**

Question 3.

600 + 10 + 5 ______

___________

Answer:Â 615 and Six hundred fifteen

Explanation

In standard form, numbers are written using only numbers. There are no words (615)

In Word form write the number by using words but no numbers ( Six hundred fifteen )

Question 4.

900 + 70 + 6 _____

___________

Answer: 976 and Nine hundred seventy six

In standard form, numbers are written using only numbers. There are no words (976)

In Word form write the number by using words but no numbers ( Nine hundred seventy six )

**Write the number in expanded form and standard form.**

Question 5.

three hundred nine

_____ + ______ + _____

______

Answer: 300+9 and 309

Explanation

In expanded form, write the number by showing the value of each digit (300+9)

In standard form, numbers are written using only numbers. There are no words (309)

Question 6.

eight hundred sixty-two

_____ + ______ + ______

_______

Answer: 800+60+2 and 862

Explanation

In expanded form, write the number by showing the value of each digit (800+60+2)

In standard form, numbers are written using only numbers. There are no words (862))

Question 7.

**Which One Doesnâ€™t Belong?**

Which does not belong with the other three?

Answer: 1 + 9 + 6 does not belong to the other three.

Question 8.

**DIG DEEPER!**

A number has 7 hundreds. The tens digit is 5 less than the hundreds digit. The ones digit is 2 more than the hundreds digit. What is the number?

______

Answer: 729

Explanation

given that, a number has 7 hundred

The tens digit is 5 less than hundreds digit

Question 9.

**Modeling Real Life**

There are 438 vegetables planted. 400 are carrots. 8 are beets. The rest are onions. How many onions are there?

______ onions

Answer: 30 onions are there

Explanation

As per the statement, There are 438 vegetables are planted

400 are carrot (438-400=38)

8 are beets (38 – 8=30)

Thus, the Remaining 30 are onions.

Question 10.

**Modeling Real Life**

There are 593 students in after-school programs. 3 students take dance class. 90 students take art class. The rest take karate class. How many students take karate class?

______ students

Answer: 500 students are in karate class.

Explanation:

As per statements, Totally there are 593 students

3 students are in dance class (593-3=590)

90 students are in art class (590-90=500)

Thus, the Remaining 500 students are in karate class.

**Review & Refresh**

Question 11.

Find the sum. Then change the order of the addends. Write the new equation.

4 + 7 = ______

_____ + _____ = ______

Answer: 11

### Lesson 7.5 Represent Numbers in Different Ways

**Explore and Grow**

Circle the models that show each number.

Answer:

**Show and Grow**

Question 1.

Show 261 two ways.

Answer:

Question 2.

Show 345 two ways.

Answer:

**Apply and Grow: Practice**

Question 3.

Show 432 two ways.

Answer:

Question 4.

Show 527 two ways.

Answer:

Question 5.

**YOU BE THE TEACHER**

Your friend says that 800 + 40 + 11 is the same as 800 + 50 +1. Is your friend correct? Explain.

_________________________

__________________________

Answer:

**Think and Grow: Modeling Real Life**

The models show how many dinosaur toys you and your friend have. Does your friend have the same number of dinosaur toys as you? Explain.

_________________________

__________________________

Answer:

**Show and Grow**

Question 6.

The models show how many trading cards you and your friend have. Does your friend have the same number of trading cards as you? Explain.

______________________

______________________

Answer:

### Represent Numbers in Different Ways Homework & Practice 7.5

Question 1.

Show 134 two ways.

Answer:

Question 2.

Show 319 two ways.

Answer:

Question 3.

**Number Sense**

Which ways show 948?

8 hundreds, 4 tens, and 8 ones

9 hundreds, 4 tens, and 8 ones

8 hundreds, 4 tens, and 9 ones

8 hundreds, 14 tens, and 9 ones

94 tens and 8 ones

948 ones

Answer:

Question 4.

**Modeling Real Life**

The models show how many bouncy balls you and your friend have. Does your friend have the same number of bouncy balls as you? Explain.

________________________

__________________________

Answer:

**Review & Refresh**

Question 5.

70 + 30 = ______

Answer: 100

Question 6.

53 + 19 = _____

Answer: 72

Question 7.

90 âˆ’ 50 = _____

Answer: 40

Question 8.

64 âˆ’ 40 = _______

Answer: 24

### Understand Place Value to 1,000 Performance Task

You make trail mix using the sunflower seeds, almonds, and raisins shown.

Question 1.

How many sunflower seeds, almonds, and raisins do you use?

______ + _____ + _____

_____

Answer: 400+ 30+ 5 is equal to 435.

Explanation

Given that, 400 sunflower seeds, 30 almonds and 5 raisinsÂ for trail mix

thus, 400+30+5= 435

Question 2.

You add another bag of almonds and another bag of raisins to your trail mix. How many sunflower seeds, almonds, and raisins are there now?

_____ + _____ + _____

______

Answer: 400+40+10= 450

Explanation

Given that, 400 sunflower seeds, 30 of almonds add another bags of almonds is contains 10 totally 40 and 5 of raisins add another bags of raisins contains 5 totally 10 raisins.

400+40+10=450

Question 3.

Your friend makes trail mix with 3 bags of sunflower seeds,13 bags of almonds, and 4 bags of raisins. Does your friend use the same number of ingredients as you? Explain.

Yes No

__________________

___________________

Answer: No, friend makes a trail mix with only 3 bags of sunflower 13 bags of almonds and 4 bag of raisins. The ingredients you used is 400 sunflower seeds,40 almonds bags and 10 raisins bags. Friend and your’s are not the same ingredients.

### Understand Place Value to 1,000 Activity

**Naming Numbers Flip and Find**

**To Play:** Place the Naming Numbers Flip and Find Cards face down in the boxes. Take turns flipping 2 cards. If your cards show the same number, keep the cards. If your cards show different numbers, ï¬‚ip the cards back over. Play until all matches are made.

**7.1 Hundreds**

**Write how many tens. Circle groups of 10 tens. Write how many hundreds. Then write the number.**

Question 1.

_____ tens

_______ hundreds

________

Answer: 40 tens and 4 hundreds

Explanation

Given that 40 tens are there by circling 10 tens

For counting tens, count columns and for counting hundreds count all the boxes.

Question 2.

_____ tens

_______ hundreds

________

Answer:Â 50 tens and 5 hundred

Explanation

Given that 50 tens are there by circling 10 tens

For counting tens, count columns and for counting hundreds count all the boxes.

Question 3.

**Modeling Real Life**

A cafeteria has 80 bags of pretzels. Each bag has 10 pretzels. The cafeteria needs 900 pretzels. How many more bags does the cafeteria need?

______ more bags

Answer: 10 bags

Explanation:

Given that, the cafeteria has 80 bags of pretzelsÂ each bags contains 10 pretzels, cafeteria needs 900 pretzels,

10 bags x 10 pretzels =100

Thus 10 bags of pretzels needs for the cafeteria.

**7.2 Model Numbers to 1,000**

Question 4.

______ hundreds, _____ tens, and _____ ones is ______.

Answer:5 hundreds 2 tens, 5 ones is 525.

Explanation

There are 5 unit of cubes each unit of cubes contains 10 tens which gives 500(10 tens in one unit of cubes x 50 tens in the whole unit of cubes = 500)

and there are 2 rod each contains 10 cubes that gives 2 tens is 20 and plus the ones 5 is 525.

Question 5.

______ hundreds, _____ tens, and _____ ones is ______.

Answer: 8 hundred,0 tens, and 3 ones is 803.

Explanation

There are 8 unit of cubes each unit of cubes contains 10 tens which gives 800(10 tens in one unit of cubes x 80 tens in the whole unit of cubes = 800)

the second digit at tens place 0 in the tens place and the right first digit is ones plus the ones 3 is 803.

Question 6.

**Number Sense**

What number is Descartes thinking about?

______

Answer:425

Explanation

The above answer represents that 4 hundreds is 400 and the second digit at tens place. The 2 is in tens place value is

20 and the right first digit is in ones place the 5 is in ones place value 5 is 425.

**7.3 Understand Place Value**

**Circle the value of the underlined digit**

Question 7.

429

200

2

2 tens

Answer: 2 tens

Explanation

Given that there is 3 digit number which is 429. A number can have many digits and each

digit has a special place and value. the second digit at tens place. The 2 is in tens place value is 20.

Question 8.

751

70

700

7 tens

Answer: 700

Explanation

Given that there is 3 digit number which is 751. A number can have many digits and each

digit has a special place and value. the first digit at hundreds place. The 7 is in hundreds place value is 700

Question 9.

**Number Sense**

Write the number that has the following values.

The tens digit has a value of 60.

The ones digit has a value of 3.

The hundreds digit has a value of 900. _______

Answer:963

Explanation:

A number can have many digits and each digit has a special place and value. the first digit at hundreds place.

The 9 is in hundreds place value is 900. The second digit at tens place the 6 is in tens place value is 60 and

the right first digit is in ones place the 3 is in ones place value 3 is 963.

**7.4 Write Three-Digit Numbers**

**Write the number in expanded form and word form.**

Question 10.

605

_____ + _____ + ______

________

Answer: 600+5 and Six hundred five

Explanation

In expanded form, write the number by showing the value of each digit (600+05)

In Word form write the number by using words but no numbers ( Six hundred five)

Question 11.

541

______ + ______ + ______

___________

Answer: 500+40+1 and Five hundred forty-one

Explanation

In expanded form, write the number by showing the value of each digit (500+40+1)

In Word form write the number by using words but no numbers (Five hundred forty-one)

**Write the number in standard form and word form.**

Question 12.

100 + 20 + 4

______

___________

Answer: 124 and One hundred twenty-four

Explanation

In standard form, numbers are written using only numbers. There are no words (124)

In Word form write the number by using words but no numbers (One hundred twenty-four)

Question 13.

700 + 8

_______

_____________

Answer: 708 and Seven hundred eight

Explanation

In standard form, numbers are written using only numbers. There are no words (708)

In Word form write the number by using words but no numbers (Seven hundred eight)

**Write the number in expanded form and standard form.**

Question 14.

three hundred thirty

_____ + _____ + _____

_____

Answer: 300+30 and 330

Explanation

In expanded form, write the number by showing the value of each digit (300+30)

In standard form, numbers are written using only numbers. There are no words. (330)

Question 15.

two hundred fifty-six

_____ + ______ + _____

______

Answer: 200+50+6 and 256

Explanation

In expanded form, write the number by showing the value of each digit (200+50+6)

In standard form, numbers are written using only numbers. There are no words. (256)

**7.5 Represent Numbers in Different Ways**

Question 16.

Show 345 two ways.

Answer: Three hundred forty-five and 300+40+5

Explanation

There are 3 digit number(345)Â 1 digit is for hundreds which is 3, 2nd digit is for tens which is 2 and the last digit for once 5 is 345

In word form for 345 is Three hundreds forty-five,

The expanded form for 345 is 300+40+5 which gives 345.

Question 17.

Show 562 two ways.

Answer: Five hundred sixty-two and 500+60+2

Explanation

There are 3 digit numbers 1 digit number is hundreds which are 5, 2nd digit number is tens which is 6 tens and the last number 2 ones is 562

In word form for 562 is Five hundred sixty-two,

The expanded form for 562 is 500+60+2 is 562.

Question 18.

Your friend says that 600 + 30 + 1 is the same as 500 + 130 + 1. Is your friend correct? Explain.

___________________

___________________

Answer: Yes correct, given that 600+30+1= 631 ( which gives) and 500+130+1 = 631( which also gives the same answer)

both equation shows the same answers.

*Conclusion:*

In this chapter, a brief explanation of the lessons are discussed in Answer Key of Big Ideas Math book Grade 2 Chapter 7 Understand Place Value to 1,000. Here we have provided the exercise problems and the solutions to help in practising the lessons. you can get the different and simple methods of solving problems in Big Ideas Math Grade 2 Answer Key Chapter 7 Understand Place Value to 1,000. Stay in touch with our site to get the latest edition solutions of all other Big Ideas Math Grade 2 Answers.