Practice with the help of enVision Math Common Core Grade 2 Answer Key **Topic 10 Add Within 1,000 Using Models and Strategies** regularly and improve your accuracy in solving questions.

## enVision Math Common Core 2nd Grade Answers Key Topic 10 Add Within 1,000 Using Models and Strategies

**enVision STEM Project: Building Up to 1,000**

Find Out Use drinking straws and pieces of tape. The total number of straws and pieces of tape cannot be more than 1,000. First, decide how many of each to use. Then share. Build the tallest buildings you can.

Journal: Make a Book Describe your building in a book. In your book, also:

- Tell how many drinking straws and pieces of tape you used.
- Tell how you would make a better building if you did it again.

**Review What You Know**

**Vocabulary**

Question 1.

Circle all of the hundreds digits in the numbers below.

Answer:

Explanation:

The digit place

Thousands Hundreds Tens Ones

5 0 2

5 8

1 0 0 0

5 and 0 are in the hundreds place and these values are circled.

Question 2.

Write the expanded form of the number.

846

____

Answer:

800 + 40 + 6 is the expanded form of 846.

Explanation:

Given number is a three digit number

8 in Hundreds place

4 in Tens place

6 in Ones place

Question 3.

Write the word form of the number.

265

_____

Answer:

265 = Two hundred and sixty five.

Explanation:

Given number is a three digit number

2 in Hundreds place

6 in Tens place

5 in Ones place

**Open Number Lines**

Question 4.

Use the open number line to find the sum.

54 + 13 = ___

Answer:

54 + 13 = 67

**Mental Math**

Question 5.

Use mental math to find each sum.

40 + 37 = ____

6 + 77 + 4 = ___

Answer:

40 + 37 = 40 + (30 + 7) = (40 + 30) + 7 = 70 + 7 = 77.

6 + 77 + 4 = (6 + 4) + 77 = 10 + 77 = 87.

Explanation:

Mental math we break the number of one addend and then giving park of one addend to the other addend.

Here in 40 + 37

we break 37 as 30 + 7

now we add 40 + 30 =70 + 7 = 77.

This simplify the adding of numbers.

In 2nd Sum

6 + 77 + 4

we add 6 + 4 =10 and then 10 + 77 = 87.

**Partial Sums**

Question 6.

Use partial sums to add.

Answer:

Explanation:

Using partial sum

we add the place values of the numbers separately.

Hundreds place value + Hundreds place value

Tens place value + Tens place value

Ones place value + Ones place value

Here

46 + 53 = (40+50) + (6 + 3) = 90 + 9 = 99

29 + 61 = (20 + 60) + (9 + 1) = 80 + 10 = 90.

**pick a Project**

**PROJECT 10A**

What are the run times of two of your favorite movies?

Project: Write Movie Reviews

**PROJECT 10B**

How many shots do basketball teams block?

Project: Make a Basketball Poster

**PROJECT 10C**

How many miles are between a State Capital and other cities?

Project: Draw a State Map

**PROJECT 10D**

How far can people hike in the Sierra Nevada Mountains?

Project: Create a Hiking Guide

### Lesson 10.1 Add 10 and 100

**Solve & Share**

**Activity**

Forest Park Nursery sells trees.

Sal buys a maple tree for $125. A spruce free costs $10 more than a maple tree. An elm tree costs $100 more than a maple tree. What is the cost of a spruce tree? An elm tree?

Use dollar bills, place-value blocks, or mental math to solve. Be ready to explain how you solved the problem.

**Visual Learning Bridge**

**Convince Me!**

Use mental math to find 567 + 10 and 567 + 100. Explain your reasoning.

**Guided Practice**

Add. Use place-value blocks or mental math.

Question 1.

Answer:

Question 2.

Answer:

Explanation:

The square cube represents 100 square and hundreds place

cube stick represents 10 cubes and tens place

single cube represents 1 cube and ones place.

In the above image

(4 square cube + 1 cube stick + 2 cubes) + 1 cube stick

(400 + 10 + 2) + 10

Adding tens place

10 +10 = 20

the value of the image = 400+20+2=422.

Question 3.

Answer:

Explanation:

The square cube represents 100 square and hundreds place

cube stick represents 10 cubes and tens place

single cube represents 1 cube and ones place.

In the above image

(3 square cube + 2 square cube) + 1 square cube

(300 + 200) + 100

Adding hundreds place

500 + 100 = 600

the value of the image = 500 + 100 = 600.

Question 4.

Answer:

Explanation:

The square cube represents 100 square and hundreds place

cube stick represents 10 cubes and tens place

single cube represents 1 cube and ones place.

In the above image

(2 square cube + 5 cube stick + 3 cubes) + 1 Square cube

(200 + 50 + 3) + 100

Adding Hundreds place values

200 + 100 = 300

the value of the image = 400+20+2=422.

**Independent Practice**

Add. Use place-value blocks or mental math.

Question 5.

164 + 100 =

Answer:

Using mental math

164 + 100

Dividing 164 into smaller parts

= (100 + 64 ) + 100

Now adding hundreds place values

100 + 100 = 200

200 + 64 = 264.

Sum = 264.

Question 6.

$837 + $10 = ___

Answer:

Using mental math

837 + 10

Dividing 837 into smaller parts

(800 + 30 + 7 ) + 10

Adding tens places

30 + 10 = 40

800+40+7 = 847.

Sum = $847.

Question 7.

329 + 100 = ___

Answer:

Using mental math

329 + 100

Dividing 329 into smaller parts

(300+ 20 + 9) + 100

Adding hundreds place

300+ 100 = 400

400+20+9 = 429

Sum = 429.

Question 8.

610 + 10 = ___

Answer:

Dividing 610 into its smaller values

(600 + 10 ) + 10

Adding tens places

10+10 = 20

= 600 + 20 = 620.

Sum = 620.

Question 9.

295 + 10 = ___

Answer:

Question 10.

$497 + $100 = ___

Answer:

Question 11.

790 + 10 = ___

Answer:

Dividing 790 into its smaller values

(700 + 90 ) + 10

Adding tens places

90+10 = 100

= 700 + 100 = 800.

Sum = 800.

Question 12.

693 + 100 = ___

Answer:

Dividing 693 into its smaller values

(600 + 90 + 3 ) + 100

Adding hundreds places

6 + 1 = 7

= 600 + 100 = 700.

= 700 + 90 + 3

= 793

Sum = 793.

Question 13.

900 + 100 = ___

Answer:

Question 14.

460 + 10 = ___

Answer:

Dividing 460 into its smaller values

(400 + 60 ) + 10

Adding tens places

6 + 1 = 7

= 60 + 10 = 70.

=400 + 70

= 470

Sum = 470.

Question 15.

185 + 10 = ___

Answer:

Dividing 185 into its smaller values

(100 + 80 + 5 ) + 10

Adding Tens places

8 + 1 = 9

= 80 + 10 = 90.

=100 + 90 + 5

= 195

Sum = 195.

Question 16.

723 + 100 = ___

Answer:

Dividing 723 into its smaller values

(700 + 20 + 3 ) + 100

Adding hundreds places

7 + 1 = 8

= 700 + 100 = 800.

= 800 + 20 + 3

= 823

Sum = 823.

**Algebra** Find the missing numbers. Use mental math to solve.

Question 17.

572 + = 672

Answer:

Given

One addend 572 and

Sum 672

Both are 3-digit number

Hundred Tens Ones

5 7 2

6 7 2

The values in the tens place and ones place are same but the values in the hundreds place are different

Subtract the hundreds place values

6 – 5 = 1

600 – 500 = 100.

The missing addend is 100.

572 + 100 = 672.

Question 18.

285 + = 385

Answer:

Given

One addend 285 and

Sum 385

Both are 3-digit number

Hundred Tens Ones

2 8 5

3 8 5

The values in the tens place and ones place are same but the values in the hundreds place are different

Subtract the hundreds place values

3 – 2 = 1

300 – 200 = 100.

The missing addend is 100.

285 + 100 = 385.

Question 19.

709 = 699 +

Answer:

Given

One addend 699 and

Sum 709

Both are 3-digit number

Hundred Tens Ones

6 9 9

7 0 9

The values in the ones place are same but the values in the tens and hundreds place are different

Adding 1 to the tens place values

9 + 1 = 10

Now the value in the tens place is 0 and 1 is carried to the hundreds place

1 is added to hundreds place vale

6 + 1 = 7

10 is the missing number.

699 + 10 = 709.

Question 20.

422 = 322 +

Answer:

Given

One addend 422 and

Sum 322

Both are 3-digit number

Hundred Tens Ones

3 2 2 -Addend

4 2 2 – Sum

The values in the tens place and ones place are same but the values in the hundreds place are different

Subtract the hundreds place values

4 – 3 = 1

400 – 300 = 100.

The missing addend is 100.

322 + 100 = 422.

Question 21.

615 + = 625

Answer:

Given

One addend 699 and

Sum 709

Both are 3-digit number

Hundred Tens Ones

6 1 5 – Addend

6 2 5 – Sum

The values in the ones place and hundreds place are same but the values in the tens are different

subtracting the tens place values

2 – 1 = 1

Now adding 1 to the addends tens place

1 + 1 = 2

10 is the missing number.

615 + 10 = 625.

Question 22.

600 = + 590

Answer:

Given

One addend 590 and

Sum 600

Both are 3-digit number

Hundred Tens Ones

5 9 0

6 0 0

The values in the ones place are same but the values in the tens and hundreds place are different

Adding 1 to the tens place values of addend

9 + 1 = 10

Now the value in the tens place is 0 and 1 is carried to the hundreds place

1 is added to hundreds place vale

5 + 1 = 6

10 is the missing number.

590 + 10 = 600.

**Problem Solving**

Solve each problem. Show your work.

Question 23.

**enVision® STEM** The Science Club asked 178 people about recycling. The club wants to ask a total of 188 people about recycling. How many more people will the Science Club need to ask?

___ more people

Answer:

Number of people The Science Club asked about recycling = 178 people

Total number of people The Science Club wants to ask about recycling = 188 people.

Number of more people The Science Club need to ask = 188 – 178 = 10.

10 more people.

Th given number is 3 digit number

Hundred place Tens place Once place

1 8 8

1 7 8

The Hundreds place value and ones place values are same. but the tens place value is different

8 – 7 = 1

80 – 70 = 10.

10 more people.

Question 24.

**Use Structure** Jordan has four $100 bills, three $20 bills, one $10 bill, and seven $1 bills. What will Jordan’s total be if Jayla gives him one more $10 bill? What will his total be if she gives him one more $100 bill?

Answer:

Number of $100 bills Jordan has = 4

Number of $20 bills Jordan has = 3

Number of $10 bills Jordan has = 1

Number of $1 Jordan has = 7

Number of $10 bills Jayla gave to Jordan = 1

Total money Jordan have after adding Jayla’s $10 bill = $400 + $60 + $10 + $10 + $7 = $487

Jayla gave more $100 bill to Jordan

Total money Jordan have after adding 1 more $100 bill = $487 + $100 = $587.

The value of the hundreds place = 4

adding 1

4 + 1 = 5.

The value of the hundreds place is 5. The remaining values remain same.

Total money Jordan has = $587.

Question 25.

**Higher Order Thinking** Think of a 3-digit number. Write a story about adding 100 to your number. Then write an equation to show your solution.

Answer:

A hotel has 250 rooms. Their is an event organized at the hotel the hotel is booked completely. Before the day of event there are 150 rooms filled. How many rooms need to be filled?

Number of room filled = 150

Total number of rooms in the hotel = 250

Number of more rooms to be filled = 250 – 150 = 100 rooms.

100 more rooms need to be filled.

Here the tens and ones place values are same but the Hundreds place value is different.

2 – 1 = 1

The difference in the hundreds place value is 1.

The difference is 100.

Question 26.

**Assessment Practice** Which equations are true? Choose all that apply.

$251 + $10 = $351

528 + 100 = 628

528 + 10 = 538

$251 + $100 = $351

Answer:

The Equations that are true are

2. 528 + 100 = 628

Adding the hundreds place values

5 + 1 = 6

Sum = 528 + 100 = 628

3. 528 + 10 = 538

Adding the tens places

2 + 1 = 3

Sum = 528 + 10 = 538.

4. $251 + $100 = $ 351

Adding the hundreds place values

2 + 1 = 3

Sum = $251 + $100 = $351

### Lesson 10.2 Add on an Open Number Line

**Activity**

**Solve & Share**

Use the open number line to find 598 + 123. Explain your work.

**Visual Learning Bridge**

**Convince Me!**

Explain how you can use an open number line to find 599 + 205.

**Guided Practice**

Use an open number line to find each sum.

Question 1.

375 + 118 = ___

Answer:

Explanation:

Here we are breaking the addend into hundreds , tens, ones which does not change its value.

The equation is 375 + 118

118 is the addend

Breaking the addend 118

118 = 100+ 10+5+3

So, adding these to 375

375+100=475

475+10 = 485

485+ 5 = 490

490 + 3= 493

375 +118 = 493.

Question 2.

670 + 232 = ___

Answer:

Explanation:

Here we are breaking the addend into hundreds , tens, ones which does not change its value.

The equation is 670 + 232

232 is the addend

Breaking the addend 232

232 = 100+ 100 + 20 + 10 + 2

So, adding these to 670

670 +100 = 770

770 +100 = 870

870 + 20 = 890

890 + 10 = 900

900 + 2 = 902

670 + 232 = 902.

**Independent Practice**

Use an open number line to find each sum.

Question 3.

269 + 156 = ___

Answer:

Explanation:

Here we are breaking the addend into hundreds , tens, ones which does not change its value.

The equation is 269 + 156

156 is the addend

Breaking the addend 156

156 = 100 + 20 + 20 + 10 + 5 + 1

So, adding these to 269

269 + 100 = 369

369 + 20 = 389

389 + 20 = 409

409 + 10 = 419

419 + 5 = 424

424 + 1 = 425

Question 4.

637 + 242 = ___

Answer:

Explanation:

Here we are breaking the addend into hundreds , tens, ones which does not change its value.

The equation is 637 + 242

242 is the addend

Breaking the addend 242

242 = 100+ 100 + 20 + 20 + 2

So, adding these to 637

637 +100 = 737

737 +100 = 837

837 + 20 = 857

857 + 20 = 877

877 + 2 = 879

637 + 242 = 879.

Question 5.

886 + 114 = ___

Answer:

Explanation:

Here we are breaking the addend into hundreds , tens, ones which does not change its value.

The equation is 886 + 114

114 is the addend

Breaking the addend 114

114 = 100+ 10 + 4

So, adding these to 886

886 +100 = 986

986 +10 = 996

996 + 4 = 1000

886 + 114 = 1000.

Question 6.

208 + 598 =

Answer:

Explanation:

Here we are breaking the addend into hundreds , tens, ones which does not change its value.

The equation is 208 + 598

598 is the addend

Breaking the addend 598

598 = 100+ 100 + 100 + 100 + 100 + 50 + 40 + 5 + 3

598 = 500 + 50+ 40 + 5 + 3

So, adding these to 208

208 + 100 = 308

308 + 100 = 408

408 + 100 = 508

508 + 100 = 608

608 + 100 = 708

708 + 50 = 758

758 + 40 = 798

798 + 5 = 803

803 + 3 = 806

Question 7.

**Higher Order Thinking** Lisa finds 550 + 298 using the open number line below. Is her work correct? Explain.

Answer:

No, Lisa work is not correct as of addition expression.

The correct way is as below

550 + 298

breaking the addend 298 into hundreds , tens, ones

298 = 100 + 100 + 50 + 40 + 5 + 3 or

298 = 200 + 90 + 8.

**Problem Solving**

Use an open number line to find each sum.

Question 8.

**Reasoning** José has 181 cards. He collects 132 more cards. How many cards does he have now?

Answer:

Question 9.

**Vocabulary** Complete the sentence using two of these terms.

>

Answer:

Question 10.

**Higher Order Thinking** Use open number lines to find 446 +215 in two different ways.

446 + 215 = ___

Answer:

Question 11.

**Assessment Practice** Mary uses an open number line to find 286 + 137. All of the jumps she draws are greater than 1. Draw what Mary could have done. Write the sum.

286 + 137 = ___

Answer:

### Lesson 10.3 Add Using Models

**Solve & Share**

**Activity**

Use place-value blocks to find 243 + 354. Tell which place value you added first and why. Then draw a picture to show your work.

**Visual Learning Bridge**

**Convince Me!**

Are the tens regrouped in the example above? How do you know?

**Guided Practice**

Use place-value blocks to find each sum. Regroup if needed.

Question 1.

223 + 106 = ___

Answer:

Question 2.

149 + 362 = ___

Answer:

**Independent Practice**

Use and draw blocks to find each sum. Regroup if needed.

Question 3.

151 + 324 = ___

Answer:

Question 4.

250 + 298 = ___

Answer:

Question 5.

258 + 109 = ___

Answer:

Question 6.

187 + 246 = ___

Answer:

Question 7.

236 + 318 = ___

Answer:

Question 8.

432 + 365 = ___

Answer:

Question 9.

**Number Sense** Jamal says that the sum of 183 + 198 is less than 300. Is Jamal’s answer reasonable? Why or why not?

Answer:

**Problem Solving**

Solve the problems below. Show your work.

Question 10.

**Reasoning** 156 children in a school are girls. 148 children in that school are boys. How many children go to that school?

___ children

Answer:

Question 11.

**Higher Order Thinking** Write an addition problem about stickers. Use 3-digit numbers. Then solve the problem.

Answer:

Question 12.

**Assessment Practice** which is the sum of 129 +268?

A. 292

B. 294

C. 389

D. 397

Answer:

### Lesson 10.4 Continue to Add Using Models and Place Value

**Activity**

**Solve & Share**

Oak School has 256 students. Pine School has 371 students. How many students do the schools have in all?

Use place-value blocks to help. Draw your blocks below and solve.

**Visual Learning Bridge**

**Convince Me!**

Look at the example above. Why don’t the Il tens need to be regrouped to get the final sum?

**Guided Practice**

Draw blocks to find the partial sums.

Record the partial sums to find the sum.

Question 1.

236 + 252 = ___

Answer:

Question 2.

328 + 124 = ___

Answer:

**Independent Practice**

Question 3.

372 + 281 = ___

Answer:

Question 4.

429 + 163 = ___

Answer:

Question 5.

174 + 245 =

Answer:

Question 6.

**Higher Order Thinking** Ben said that the sum of 157 and 137 is 284. Nikki said that Ben made a mistake. Who is correct? Explain.

Answer:

**Problem Solving**

Solve each problem below. You can use models to help.

Question 7.

**Model** On Friday, 354 people went to the fair. On Saturday, 551 people went to the fair.

How many people went to the fair in all?

___ people

Answer:

Question 8.

**Higher Order Thinking** Write an addition problem in which the partial sum for tens is greater than 10 tens. Draw blocks and show partial sums to solve.

___ + ___ = ___

Answer:

Question 9.

**Assessment Practice** Find 448 + 323. Draw place-value blocks and show partial sums to solve.

448 + 323 = ___

Answer:

### Lesson 10.5 Add Using Place Value and Partial Sums

**Activity**

**Solve & Share**

On Monday, 248 people visit the museum. On Tuesday, 325 people visit the museum. How many people visit the museum on Monday and Tuesday? Solve any way you choose. Be prepared to explain your thinking.

**Visual Learning Bridge**

**Convince Me!**

Can the problem above be solved by adding the ones first, then the tens, and then the hundreds ? Explain.

**Guided Practice**

Add. Use partial sums. Show your work. Use place-value blocks if needed.

Question 1.

425 + 148 = ___

Answer:

Question 2.

394 + 276 = ___

Answer:

**Independent Practice**

Add. Use partial sums. Show your work.

Question 3.

Answer:

Question 4.

Answer:

Question 5.

Answer:

Question 6.

Answer:

Question 7.

Answer:

Question 8.

**Higher Order Thinking** Mark found the sum of 127 and 345. Explain his mistake. What is the correct sum?

Answer:

Question 9.

**Reasoning** Rhea has a $100 bill, four $20 bills, one $10 bill, and three $5 bills. Is this amount greater or less than $210? Explain.

Answer:

**Problem Solving**

Solve each problem. Show your work.

Question 10.

Look for Patterns 349 people are on a boat. 255 people are on another boat. How many people are on both boats?

___ people

Answer:

Question 11.

163 students are in first grade. 217 students are in second grade. How many students are in both grades?

___ students

Answer:

Question 12.

**Higher Order Thinking** Choose a number between 100 and 400. Add 384 to your number. What is the sum? Show your work. Explain the steps you took to find the sum.

Answer:

Question 13.

**Assessment Practice** which is the same amount as 238 + 164? Choose all that apply.

200 + 190 + 12

300 + 90 + 12

402

400 + 10 + 2

Answer:

### Lesson 10.6 Explain Addition Strategies

**Activity**

**Solve & Share**

Find 375 + 235. Explain your strategy. Then explain why your strategy works.

**Visual Learning Bridge**

**Convince Me!**

Choose a strategy shown above. Explain why it works.

**Guided Practice**

Use the strategy to solve the problem. Show your work. Then explain your work.

Question 1.

624 + 248 = __872
Answer:__

**Independent Practice**

Choose any strategy to solve each addition problem. Show your work. Then explain why the strategy works.

Question 2.

212 + 487 = ___

Answer:

Question 3.

874 + 109 = ___

Answer:

Question 4.

419 + 532 = ___

Answer:

Question 5.

650 + 270 = ___

Answer:

**Problem Solving**

Solve each problem any way you choose. Show your work.

Question 6.

**Reasoning** Lee School needs 407 folders for its students. Jefferson School needs 321 folders for its students. How many folders do both schools need?

___ folders

Answer:

Question 7.

**Reasoning** There are 229 people at the football game. 108 more people arrive at the game. How many people are at the football game now?

___ people

Answer:

Question 8.

**Higher Order Thinking** Tommy found 125 + 598. Since 598 is close to 600, he added 125 + 600 = 725. Then he subtracted 2 to get 723. Why did Tommy subtract 2? Explain.

Answer:

Question 9.

**Assessment Practice** There are 192 ants on an ant farm. 397 more ants join the ant farm. How many ants are on the ant farm now? Use the number line to solve. Explain.

Answer:

### Lesson 10.7 Repeated Reasoning

**Problem Solving**

**Activity**

**Solve & Share**

Solve these problems any way you choose. Explain patterns you see.

63 + 28 = ?

263 + 128 = ?

**Thinking Habits**

What can I use from one problem to help with another problem? Are there things that repeat?

**Visual Learning Bridge**

**Convince Me!**

If you start with 36 and add on 24, in the example above, will you get the same sum? Explain.

**Guided Practice**

Use repeated reasoning to solve the two problems. Circle the digits that are the same in the sums. Explain why the sums are different.

Question 1.

Answer:

**Independent Practice**

Solve each problem.

Question 2.

Write a problem where you need to regroup to make a ten or a hundred. Each addend must be three digits. Draw place-value blocks to solve your problem. Then explain why you needed to regroup.

___ + ___ = ____

Answer:

Question 3.

Write a problem where you do not need to regroup to make a ten or a hundred. Each addend must be three digits. Draw place value blocks to solve your problem. Then explain why you did not need to regroup.

___ + ___ = ____

Answer:

**Problem Solving**

**Performance Task**

**Tickets Sold**

The table shows how many tickets were sold at a theater. How many tickets were sold on Thursday and Saturday in all?

Question 4.

**Make Sense** Which numbers and operation can you use to solve the problem?

Answer:

Question 5.

**Model** Write an equation that shows the problem you need to solve.

Answer:

Question 6.

**Generalize** Use what you know about adding 3-digit numbers to solve the problem. Explain what you did.

Answer:

### Topic 10 Fluency Practice

**Point&Tally**

Find a partner. Get paper and a pencil. Each partner chooses a different color: light blue or dark blue.

Partner I and Partner 2 each point to a black number at the same time. Both partners subtract Partner 2’s number from Partner l’s number.

If the answer is on your color, you get a tally mark. Work until one partner gets seven tally marks.

**Topic 10 Vocabulary Review**

**Understand Vocabulary**

Choose a term from the Word List to complete each sentence.

Word List

• addend

• break apart

• digits

• hundreds

• mental math

• open number line

• partial sum

• sum

Question 1.

When adding 193 + 564, the sum of 90 + 60 is called a ___

Answer:

Question 2.

In 709 + 187, 709 is an ___

Answer:

Question 3.

You can use an ___ to count on.

Answer:

Question 4.

In 841, there are ___ hundreds

Answer:

Question 5.

Give the value of each digit in 610.

Answer:

Question 6.

Use mental math to find 198 + 362.

Answer:

**Use Vocabulary in Writing**

Question 7.

Use words to tell how to find 249 + 201. Use terms from the Word List.

Answer:

### Topic 10 Reteaching

**Set A**

You can use mental math to add 10 or 100 to 362.

Add using place-value blocks or mental math.

Question 1.

600 + 10 = ___

Answer:

Question 2.

345 + 100 = ___

Answer:

Question 3.

543 + 100 = ___

Answer:

Question 4.

800 + 100 = ___

Answer:

Question 5.

799 + 10 = ___

Answer:

Question 6.

119 + 10 = ___

Answer:

**Set B**

You can use an open number line to add. Find 327 + 126.

First, place 327 on the line and then count on by 100s, 10s, and 1s.

Use an open number line to find each sum.

Question 7.

594 + 132 = ___

Answer:

Question 8.

157 + 245 = ___

Answer:

**Set C**

You can use or draw place-value blocks and use partial sums to add. Find 276 + 137.

Add. Use partial sums. Show your work. Use drawings of blocks if needed.

Question 9.

408 + 326 = ___

Answer:

**Set D**

**Thinking Habits**

**Repeated Reasoning**

What can I use from one problem to help with another problem? Are there things that repeat?

Solve each problem. Use partial sums and repeated reasoning. Use drawings of blocks if needed.

Question 10.

Circle the digits that are alike in each sum.

Answer:

### Topic 10 Assessment Practice

Question 1.

Emily has 100 sun stickers. She has 382 star stickers and 10 moon stickers. How many sun and star stickers does Emily have?

Answer:

Question 2.

Tyrone collects baseball cards. He gives 138 cards to his friend. Now he has 428 cards. How many cards did Tyrone have before he gave some away?

___ cards

Answer:

Question 3.

Use the open number line to solve the problem. Write the missing numbers in the boxes.

421 + 250 = ?

Answer:

Question 4.

Which is the same amount as 528 + 167? Choose all that apply.

500 + 80 + 15

500 + 180 + 15

600 + 90 + 5

600 + 80 + 15

Answer:

Question 5.

Choose all the equations in which the sum is 488.

478 + 10 = ?

388 + 100 = ?

248 + 240 = ?

200 + 265 = ?

Answer:

Question 6.

Rich has 335 pennies. Beth has 58 more pennies than Rich. How many pennies do they have in all?

Hundreds

A. 277

B. 393

C. 628

D. 728

Answer:

Question 7.

Use place value and partial sums to find 472 + 256. Show your work.

472 + 256 = ___

Answer:

Question 8.

Molly reads 184 pages. Pat reads 294 pages. What is the total number of pages they read in all?

Use any strategy. Show your work and explain.

Answer:

Question 9.

On Saturday, 449 people visit the zoo. On Sunday, 423 people visit the zoo. How many people visit the zoo in all? Use the open number line to solve. Explain your work.

Answer:

### Topic 10 Performance Task

**Recycling Race**

Westbrook School is having a recycling contest. The table shows the number of cans each grade collected in February.

Answer:

Question 1.

How many cans did the first-grade students and the second-grade students collect in all?

Use the open number line to solve.

__ cans

Answer:

Question 2.

Bruce used partial sums to find how many cans the third-grade students and fourth-grade students collected in all.

Do you agree with his answer?

Circle yes or no.

Explain your answer.

Answer:

Question 3.

Which two grades collected a total of 689 cans? Choose any strategy to solve the problem. Show your work. Explain which strategy you used.

The ___ grade and the ___ grade collected a total of 689 cans.

Answer:

Question 4.

The second-grade collected 432 cans in March. They collected 198 cans in April. Tom and Bill find how many cans the class collected in March and April.

Who added correctly? Explain.

Who answered incorrectly? What did he do?

Answer: