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Take Apart Hundreds to Subtract

Mental math can make subtraction easier.

600 - 99 = 501

100 500

100 - 99 = 1

500 + 1 = 501

Break apart hundreds to subtract mentally.

1. 303 - 98 = / \

100 203

100 - 98 =

203 + =

3. 360 - 99 = / \

- =

+ =

2. 500 - 97 = / \

100 - 97 =

400 + =

4. 304 - 98 = / \

- =

+ =

You can break apart 600 to be 100 and 500.

99 is 1 away from 100.Add the 1 to 500 to get

your answer.

60 Grade 2 • Chapter 7 Subtract Three-Digit Numbers

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Lesson 2 Reteach

Subtract Hundreds

Find 600 - 300.

6 hundreds - 3 hundreds = hundreds

600 - 300 =

Subtract.

1. 4 hundreds - 1 hundred = hundreds

400 - 100 =

2. 7 hundreds - 3 hundreds = hundreds

700 - 300 =

3. 8 hundreds - 5 hundreds = hundreds

800 - 500 =

4. 600 500 800 600 500 - 100 - 200 - 300 - 200 - 100

Grade 2 • Chapter 7 Subtract Three-Digit Numbers 61


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Mentally Subtract 10 or 100

Mentally subtract 100.

300 - 200

3 - 2 = 1So, 300 - 200 = 100 .

Mentally subtract 10.

230 - 10

3 - 1 = 2So, 230 - 10 = 220 .

Subtract.

1. 500 - 200

5 - 2 = 3 So, 500 - 200 = 300 .

3. 600 - 300

6 - 3 =

So, 600 - 300 = .

5. 400 - 400

4 - 4 =

So, 400 - 400 = .

2. 650 - 20

5 - 2 =

So, 650 - 20 = .

4. 870 - 10

7 - 1 =

So, 870 + 10 = .

6. 330 - 30

3 - 3 =

So, 330 - 30 = .



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Lesson 4 Reteach

Regroup Tens

hundreds tens ones

1 6 3 - 1 3 5

Remember: Regroup 1 ten as 10 ones.

Use the base-ten blocks to subtract.

1. hundreds tens ones

4 3 7 - 2 1 8

Use base-ten blocks and WorkMat 7. Subtract.

2. 321 - 13 = 3. 549 - 211 =

4. 869 - 5 = 5. 623 - 415 =

6. 460 - 152 = 7. 708 - 26 = Grade 2 • Chapter 7 Subtract Three-Digit Numbers 63


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Regroup Hundreds

Step 1 Step 2 Step 3

Subtract the ones. Subtract the tens. Subtract the

Write how many Regroup 1 hundred hundreds.

ones are left. as 10 tens. Write Write how many the new number of hundreds hundreds and tens in are left. the boxes.

hundreds tens ones

2 1 7 - 1 3 4

hundreds tens ones

2 1 7 - 1 3 4

hundreds tens ones

2 1 7 - 1 3 4

Use base-ten blocks and WorkMat 7. Subtract.

1. 827 - 433 = 2. 245 - 153 =

3. 597 - 489 = 4. 762 - 234 =

5. 624 - 325 = 6. 943 - 144 = 64 Grade 2 • Chapter 7 Subtract Three-Digit Numbers


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Lesson 6 Reteach

Three-Digit Subtraction

Step 1 Subtract ones.

You cannot take 7 ones from 4 ones.Regroup 1 ten as 10 ones.Now you can subtract 7.

Step 2 Subtract tens.

You can cross out 3 rods.

Step 3 Subtract hundreds.

You can cross out 1 flat.

Count the blocks you have left.You have 1 flat and 7 cubes.

244 - 137 =

You can use base-ten blocks to help subtract

three-digit numbers.

Hundreds Tens Ones

2 4 4 - 1 3 7



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Rewrite Three-Digit Subtraction

You can write a subtraction fact two different

ways.

548548 – 230 = 318 is the same as - 230

318

Subtract.

1. 708 708 – 501 = is the same as - 501

2. 100 100 – 75 = is the same as - 75

3. 369 369 – 258 = is the same as - 258

4. 602 602 – 199 = is the same as - 199



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Lesson 8 Reteach (1)

Problem Solving STRATEGY: Write a Number Sentence

There were 185 apples growing

on a tree. Andrew and his sister

picked 62 apples and put them

in the basket. How many apples

are left on the tree?

What do I know?

There are 185 apples on the tree. 62 apples were picked.

What do I need to find?

How many apples are left on the tree?

Understand

Step 1

Plan

Step 2

Solve

Step 3 Write a Number Sentence.

185

62 ?

185 - 62 = 123 apples left

Check

Step 4Is my answer reasonable?

How do I know?

How will I solve the problem?

I can write a number sentence.



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use.Lesson 8 Reteach (2)

Problem Solving STRATEGY: Write a Number Sentence

Write a number sentence to solve.

1. Tara bought 79 paints at the art supply store. She bought 100 brushes. How many more brushes did she buy?

brushes

2. Cameron’s Corner Coffee Shop sold 962 cups of coffee in the morning and 491 cups in the afternoon. How many more cups of coffee did Cameron sell in the morning?

cups of coffee

3. The school library has a goal to receive 800 books during a book drive. So far, they have received 543 books. How many more books do they need to reach their goal?

books

4. Brayden took a math test with 200 questions. He got 188 questions right. How many questions did he miss?

questions68 Grade 2 • Chapter 7 Subtract Three-Digit Numbers


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You can use place-value charts to help you

regroup across zeros.

Find 305 - 176.

Step 1 Step 2 Step 3

Subtract the ones.No tens to regroup.Regroup the hundreds.

Regroup the tens. Subtract the ones, tens, and hundreds.

hundreds tens ones

3 0 5 – 1 7 6

hundreds tens ones

3 0 5 – 1 7 6

hundreds tens ones

3 0 5 – 1 7 6 1 2 9

Subtract. Check your answer.

1. 106 - 28

6. 205 - 92

2. 503 - 167

7. 308 - 175

3. 405 - 218

8. 300 - 56

4. 601 - 378

9. 505 - 90

5. 200 - 145

10. 802 - 132

11. 500 - 418 = 12. 206 - 138 =

13. 801 - 482 = 14. 100 - 33 =

15. 607 - 527 = 16. 700 - 19 =

Lesson 9 Reteach

Subtract Across Zeros



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