All the solutions provided in **McGraw Hill My Math Grade 2 Answer Key PDF Chapter 7 Lesson 4 Regroup Tens **will give you a clear idea of the concepts.

## McGraw-Hill My Math Grade 2 Answer Key Chapter 7 Lesson 4 Regroup Tens

**Explore and Explain**

_____________ jump ropes

**Teacher Directions:** Use base-ten blocks to solve. Mr. Hicks, our gym teacher, had 145 jump ropes. 36 jump ropes broke this year. How many jump ropes does Mr. Hicks have left? Write the number.

Answer:

145 – 36 = 109

Explanation:

Given,

Mr. Hicks had 145 jump ropes.

36 jump ropes broke this year.

The difference between them gives us Mr. Hicks left

145 – 36 = 109 jump ropes are left.

**See and Show**

Find 652 – 429.

Step 1:

Subtract the ones. You cannot subtract 9 from 2. Regroup 1 ten as 10 ones.

Step 2:

Subtract the tens.

Step 3:

Subtract the hundreds.

**Use Work Mat 7 and base-ten blocks. Subtract.**

Question 1.

Answer:

529

Explanation:

1. Arrange the numbers vertically to solve the subtraction of three-digit numbers.

2. Subtract the one’s column. Here 9 > 7 so we cannot subtract 7 from 6. Therefore regroup 4 tens and 6 ones = 3 tens and 16 ones.

Subtract 16 – 7 = 9 ones.

3. Now subtract the tens column. 3 – 1 = 2 tens.

4. Bring down the 5. Therefore the answer is 5.

Question 2.

Answer:

344

Explanation:

1. Arrange the numbers vertically to solve the subtraction of three-digit numbers.

2. Subtract the one’s column. Here 9 > 3 so we cannot subtract 9 from 3. Therefore regroup 8 tens and 3 ones = 7 tens and 13 ones.

Subtract 17 – 9 = 8 ones.

3. Now subtract the tens column. 7 – 3 = 4 tens.

4 Next subtract the hundreds column = 7 – 4 = 3 hundreds.

**Talk Math** How is subtracting three-digit numbers like subtracting two-digit numbers?

Answer:

If we subtract three-digit numbers there will be hundreds of blocks but if we subtract two-digit numbers there will be tens and one’s block. Let us see an example for both subtractions.

Explanation:

Example for three-digit number subtraction

Example for two-digit number subtraction

**On My Own**

**Use Work Mat 7 and base-ten blocks. Subtract.**

Question 3.

Answer:

254

Explanation:

1. Arrange the numbers vertically to solve the subtraction of three-digit numbers.

2. Subtract the one’s column. Here 8 > 2 so we cannot subtract 8 from 2. Therefore regroup 8 tens and 2 ones = 7 tens and 12 ones.

Subtract 17 – 9 = 8 ones.

3. Now subtract the tens column. 7 – 2 = 5 tens.

4 Next subtract the hundreds column = 3 – 1 = 2 hundreds.

Question 4.

Answer:

418

Explanation:

1. Arrange the numbers vertically to solve the subtraction of three-digit numbers.

2. Subtract the one’s column. Here 9 > 7 so we cannot subtract 9 from 7. Therefore regroup 6 tens and 7 ones = 5 tens and 17 ones.

Subtract 17 – 9 = 8 ones.

3. Now subtract the tens column. 5 – 4 = 1 tens. Next bring down the 4.

Question 5.

Answer:

509

Explanation:

1. Arrange the numbers vertically to solve the subtraction of three-digit numbers.

2. Subtract the one’s column. Here 6 > 5 so we cannot subtract 6 from 5. Therefore regroup 7 tens and 5 ones = 6 tens and 15 ones.

Subtract 15 – 6 = 9 ones.

3. Now subtract the tens column. 6 – 6 = 0 tens.

4. Bring down the 5. Therefore the answer is 5.

Question 6.

Answer:

645

Explanation:

1. Arrange the numbers vertically to solve the subtraction of three-digit numbers.

2. Subtract the one’s column. Here 8 > 3 so we cannot subtract 8 from 3. Therefore regroup 6 tens and 3 ones = 5 tens and 13 ones.

Subtract 13 – 8 = 5 ones.

3. Now subtract the tens column. 5 – 1 = 4 tens.

4. Next subtract the hundreds column 8 – 2 = 6 hundreds.

Question 7.

Answer:

129

Explanation:

1. Arrange the numbers vertically to solve the subtraction of three-digit numbers.

2. Subtract the one’s column. Here 5 > 4 so we cannot subtract 5 from 4. Therefore regroup 5 tens and 7 ones = 5 tens and 14 ones.

Subtract 14 – 5 = 9 ones.

3. Now subtract the tens column. 5 – 3 = 2 tens.

4 Next subtract the hundreds column 2 – 1 = 1 hundreds

Question 8.

Answer:

247

Explanation:

1. Arrange the numbers vertically to solve the subtraction of three-digit numbers.

2. Subtract the one’s column. Here 7 > 4 so we cannot subtract 7 from 4. Therefore regroup 5 tens and 4 ones = 4 tens and 0 ones.

Subtract 14 – 7 = 7 ones.

3. Now subtract the tens column. 4 – 0 = 4 tens.

4. Next subtract the hundreds column = 7 – 5 = 2 hundreds

Question 9.

Answer:

129

Explanation:

1. Arrange the numbers vertically to solve the subtraction of three-digit numbers.

2. Subtract the one’s column. Here 6 > 5 so we cannot subtract 6 from 5. Therefore regroup 4 tens and 2 ones = 4 tens and 15 ones.

Subtract 15 – 6 = 9 ones.

3. Now subtract the tens column. 4 – 2 = 2 tens.

4 Next subtract the hundreds column = 4 – 3 = 1 hundreds

Question 10.

Answer:

502

Explanation:

1. Arrange the numbers vertically to solve the subtraction of three-digit numbers.

2. Subtract the one’s column. Here 8 > 0 so we cannot subtract 8 from 0. Therefore regroup 3 tens and 0 ones = 2 tens and 10 ones.

Subtract 10 – 8 = 2 ones.

3. Now subtract the tens column. 2 – 2 = 0 tens.

4. Next subtract the hundreds column = 9 – 4 = 5 hundreds.

Question 11.

Answer:

344

Explanation:

1. Arrange the numbers vertically to solve the subtraction of three-digit numbers.

2. Subtract the one’s column. Here 6 > 0 so we cannot subtract 6 from 0. Therefore regroup 8 tens and 10 ones = 7 tens and 10 ones.

Subtract 10 – 6 = 4 ones.

3. Now subtract the tens column. 7 – 3 = 4 tens.

4. Next subtract the hundreds column 7 – 4 = 3 hundreds.

Question 12.

Answer:

617

Explanation:

1. Arrange the numbers vertically to solve the subtraction of three-digit numbers.

2. Subtract the one’s column. Here 5 > 2 so we cannot subtract 5 from 2. Therefore regroup 4 tens and 2 ones = 4 tens and 12 ones.

Subtract 12 – 5 = 7 ones.

3. Now subtract the tens column. 12 – 5 = 7 tens.

4. Bring down the 6. The answer is 617.

Question 13.

Answer:

925

Explanation:

1. Arrange the numbers vertically to solve the subtraction of three-digit numbers.

2. Subtract the one’s column. Here 6 > 1 so we cannot subtract 6 from 1. Therefore regroup 3 tens and 1 ones = 2 tens and 11 ones.

Subtract 11 – 6 = 5 ones.

3. Bring down the 9 and 2.

Question 14.

Answer:

369

Explanation:

1. Arrange the numbers vertically to solve the subtraction of three-digit numbers.

2. Subtract the one’s column. Here 8 > 7 so we cannot subtract 8 from 7. Therefore regroup 8 tens and 7 ones = 7 tens and 17 ones.

Subtract 17 – 8 = 9 ones.

3. Now subtract the tens column. 7 – 1 = 6 tens.

4. Bring down the 3. The answer is 369.

Question 15.

Answer:

304

Explanation:

1. Arrange the numbers vertically to solve the subtraction of three-digit numbers.

2. Subtract the one’s column. Here 9 > 3 so we cannot subtract 9 from 3. Therefore regroup 1 tens and 3 ones = 1 tens and 13 ones.

Subtract 13 – 9 = 4 ones.

3. Now subtract the tens column. 1 – 1 = 0 tens.

4. Next subtract the hundreds column 4 – 1 = 3 hundreds.

Question 16.

Answer:

525

Explanation:

1. Arrange the numbers vertically to solve the subtraction of three-digit numbers.

2. Subtract the one’s column. Here 5 > 0 so we cannot subtract 5 from 0. Therefore regroup 3 tens and 10 ones = 3 tens and 10 ones.

Subtract 10 – 5 = 5 ones.

3. Now subtract the tens column. 3 – 1 = 2 tens.

4. Bring down the 5. Therefore the subtraction of the given numbers is 525.

**Problem Solving**

Question 17.

Ada jumped 382 times in a row. Helen jumped 277 times in a row. How many more jumps in a row did Ada do than Helen?

_____________ jumps

Answer:

382 – 277 = 105

Explanation:

Given,

Ada jumped 382 times in a row.

Helen jumped 277 times in a row.

Find: How many more jumps in a row did Ada do than Helen?

The difference between Ada jumping and Helen jumping gives us the number of jumps in a row.

382 – 277 = 105

Question 18.

A store had 472 bouncy balls. They sold 155. How many bouncy balls were left?

______________ bouncy balls

Answer:

317 bouncy balls.

Explanation:

Given,

A store had 472 bouncy balls

Sold 155 balls.

Find: How many bouncy balls were left?

The difference between the bouncy balls they had and sold balls gives us How many bouncy balls were left?

472 – 155

317 bouncy balls.

Question 19.

Lisa hit 294 golf balls in one day. She hit 149 in the morning. How many golf balls did she hit in the afternoon?

_____________ golf balls

Answer:

145 golf balls.

Explanation:

Given,

Lisa hit 294 golf balls in one day.

She hit 149 in the morning.

294 – 149 = 145

Hence there are 145 golf balls she hit in the afternoon.

**HOT Problem** Andre wrote 381 – 165 – 224. Tell why Andre is wrong. Make it right.

Answer:

Andre is wrong because he didn’t write the result.

Explanation:

Given,

381 – 165 – 224

this we need to write in the equation

381 – 165 – 224 = 0

The correct answer is 381 – 165 – 224 = 0

### McGraw Hill My Math Grade 2 Chapter 7 Lesson 4 My Homework Answer Key

**Practice**

**Subtract.**

Question 1.

Answer:

619

Explanation:

1. Arrange the numbers vertically to solve the subtraction of three-digit numbers.

2. Subtract the one’s column. Here 6 > 5 so we cannot subtract 6 from 5. Therefore regroup 3 tens and 5 ones = 2 tens and 15 ones.

Subtract 15 – 6 = 9 ones.

3. Now subtract the tens column. 2 – 1 = 1 tens.

4 Next subtract the hundreds column = 8 – 2 = 6 hundreds

Question 2.

Answer:

315

Explanation:

1. Arrange the numbers vertically to solve the subtraction of three-digit numbers.

2. Subtract the one’s column. Here 7 > 2 so we cannot subtract 7 from 2. Therefore regroup 5 tens and 2 ones = 4 tens and 12 ones.

Subtract 12 – 7 = 5 ones.

3. Now subtract the tens column. 4 – 3 = 1 tens.

4. Next subtract the hundreds column 9 – 6 = 3 hundreds

Question 3.

Answer:

109

Explanation:

1. Arrange the numbers vertically to solve the subtraction of three-digit numbers.

2. Subtract the one’s column. Here 4 > 3 so we cannot subtract 4 from 3. Therefore regroup 5 tens and 3 ones = 4 tens and 13 ones.

Subtract 13 – 4 = 9 ones.

3. Now subtract the tens column. 4 – 4 = 0 tens.

4. Bring down the 1. The subtraction for the given number is 109.

Question 4.

Answer:

427

Explanation:

1. Arrange the numbers vertically to solve the subtraction of three-digit numbers.

2. Subtract the one’s column. Here 5 > 2 so we cannot subtract 5 from 2. Therefore regroup 4 tens and 2 ones = 3 tens and 12 ones.

Subtract 12 – 5 = 7 ones.

3. Now subtract the tens column. 3 – 1 = 2 tens.

4. Next subtract the hundreds column 6 – 2 = 4 hundreds

Question 5.

Answer:

506

Explanation:

1. Arrange the numbers vertically to solve the subtraction of three-digit numbers.

2. Subtract the one’s column. Here 8 > 4 so we cannot subtract 8 from 4. Therefore regroup 2 tens and 4 ones = 2 tens and 14 ones.

Subtract 14 – 4 = 6 ones.

3. Now subtract the tens column. 2 – 2 = 1 tens.

4 Next subtract the hundreds column = 7 – 2 = 5 hundreds

**Subtract.**

Question 6.

Answer:

106

Explanation:

1. Arrange the numbers vertically to solve the subtraction of three-digit numbers.

2. Subtract the one’s column. Here 7 > 3 so we cannot subtract 7 from 3. Therefore regroup 5 tens and 3 ones = 4 tens and 13 ones.

Subtract 13 – 7 = 6 ones.

3. Now subtract the tens column. 4 – 4 = 0 tens.

4. Bring down the 1. The subtraction of the given numbers is 106.

Question 7.

Answer:

427

Explanation:

1. Arrange the numbers vertically to solve the subtraction of three-digit numbers.

2. Subtract the one’s column. Here 5 > 2 so we cannot subtract 5 from 2. Therefore regroup 3 tens and 2 ones = 3 tens and 12 ones.

Subtract 12 – 5 = 7 ones.

3. Now subtract the tens column. 3 – 1 = 2 tens.

4 Next subtract the hundreds column = 6 – 2 = 4 hundreds.

Question 8.

Answer:

247

Explanation:

1. Arrange the numbers vertically to solve the subtraction of three-digit numbers.

2. Subtract the one’s column. Here 5 > 4 so we cannot subtract 5 from 4. Therefore regroup 5 tens and 4 ones = 3 tens and 14 ones.

Subtract 14 – 5 = 9 ones.

3. Now subtract the tens column. 3 – 2 = 1 tens.

4. Next subtract the hundreds column = 7 – 2 = 5 hundreds.

Question 9.

Answer:

309

Explanation:

1. Arrange the numbers vertically to solve the subtraction of three-digit numbers.

2. Subtract the one’s column. Here 9 > 8 so we cannot subtract 9 from 8. Therefore regroup 3 tens and 8 ones = 2 tens and 18 ones.

Subtract 18 – 9 = 9 ones.

3. Now subtract the tens column. 2 – 2 = 0 tens.

4 Next subtract the hundreds column = 4 – 1 = 3 hundreds

Question 10.

Answer:

214

Explanation:

1. Arrange the numbers vertically to solve the subtraction of three-digit numbers.

2. Subtract the one’s column. Here 8 > 2 so we cannot subtract 8 from 2. Therefore regroup 6 tens and 2 ones = 5 tens and 12 ones.

Subtract 12- 8 = 4 ones.

3. Now subtract the tens column. 5 – 4 = 1 tens.

4 Next subtract the hundreds column = 3 – 1 = 2 hundreds

Question 11.

Answer:

413

Explanation:

1. Arrange the numbers vertically to solve the subtraction of three-digit numbers.

2. Subtract the one’s column. Here 9 > 2 so we cannot subtract 9 from 2. Therefore regroup 6 tens and 2 ones = 5 tens and 12 ones.

Subtract 12 – 9 = 3 ones.

3. Now subtract the tens column. 5 – 4 = 1 tens.

4. Next subtract the hundreds column 7 – 3 = 4 hundreds

Question 12.

Answer:

129

Explanation:

1. Arrange the numbers vertically to solve the subtraction of three-digit numbers.

2. Subtract the one’s column. Here 9 > 7 so we cannot subtract 9 from 4. Therefore regroup 5 tens and 7 ones = 14 tens and 17 ones.

Subtract 17 – 9 = 8 ones.

3. Now subtract the tens column. 14 – 8 = 6 tens.

4 Next subtract the hundreds column = 6 – 4 = 2 hundreds

Question 13.

Answer:

214

Explanation:

1. Arrange the numbers vertically to solve the subtraction of three-digit numbers.

2. Subtract the one’s column. Subtract 7 – 3 = 4 ones.

3. Now subtract the tens column. 7 – 6 = 1 tens.

4 Next subtract the hundreds column = 3 – 1 = 2 hundreds.

Question 14.

725 people came to my school’s pancake breakfast. 318 of those people were children. How many adults were at the breakfast?

_____________ adults

Answer:

407 adults.

Explanation:

Given,

725 people came to my school’s pancake breakfast.

318 of those people were children

The difference between them gives us the number of adults at the breakfast.

725 – 318

= 407 adults.

**Test Practice**

Question 15.

Which subtraction problem needs regrouping to solve?

(A) 392 – 222

(B) 692 – 321

(C) 385 – 266

(D) 295 – 172

Answer:

385 – 266 subtraction problem needs regrouping to solve.

**Math at Home** Write a subtraction problem that requires regrouping tens on a piece of paper for your child to solve. Have your child explain each step to solving the problem. Try one-, two-, and three-digit subtraction problems.

Answer:

Example of 1 digit number

9 – 8 = 1

Example of 2 digit number

43 – 34 = 9

Let us take an example of a three-digit number.

757 – 489 = 268.

Explanation:

1. Arrange the numbers vertically to solve the subtraction of three-digit numbers.

2. Subtract the one’s column. Here 9 > 7 so we cannot subtract 9 from 7. Therefore regroup 5 tens and 7 ones = 14 tens and 17 ones.

Subtract 17 – 9 = 8 ones.

3. Now subtract the tens column. 14 – 8 = 6 tens.

4 Next subtract the hundreds column = 6 – 4 = 2 hundreds