All the solutions provided in **McGraw Hill My Math Grade 2 Answer Key PDF Chapter 7 Lesson 7 Rewrite Three-Digit Subtraction **will give you a clear idea of the concepts.

## McGraw-Hill My Math Grade 2 Answer Key Chapter 7 Lesson 7 Rewrite Three-Digit Subtraction

**Explore and Explain**

_____________ pages

**Teacher Directions:** Our teacher is reading a very long book to our class. The book has 385 pages. So for, she has read 266 pages of the book. How many pages does she have left to read? Write the numbers in the place-value chart and subtract.

Answer:

There are 119 pages left to read.

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 5 from 6. Therefore regroup 8 tens and 5 ones = 7 tens and 15 ones.

Subtract 15 – 6 = 9 ones.

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

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

**See and Show**

You can rewrite a problem to subtract.

Find 368 – 279.

Step 1: Rewrite.

Step 2: Subtract.

**Rewrite the problem. Subtract.**

Question 1.

336 – 272

Answer:

64

Explanation:

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

2. Subtract the one’s column. Subtract 6 – 2 = 4 ones.

3. Now subtract the tens column. Here 7 > 3 so we cannot subtract 3 from 7. Therefore regroup 3 hundreds and 3 tens = 2 hundreds and 13 tens. Subtract 13 – 7 = 6 tens.

4. Next subtract the hundreds column = 2 – 2 = 0 hundreds.

Question 2.

377 – 264

Answer:

113

Explanation:

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

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

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

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

Question 3.

633 – 265

Answer:

368

Explanation:

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

2. Subtract the one’s column. Here 5 > 3 so we cannot subtract 3 from 5. Therefore regroup 3 tens and 3 ones = 12 tens and 13 ones.

Subtract 13 – 5 = 8 ones.

3. Now subtract the tens column. 12 – 6 = 6 tens.

4. Next subtract the hundreds column = 5 – 2 = 3 hundreds

Question 4.

264 – 175

Answer:

89

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 4 from 5. Therefore regroup 6 tens and 4 ones = 15 tens and 14 ones.

Subtract 14 – 5 = 9 ones.

3. Now subtract the tens column. 15 – 7 = 8 tens.

4. Next subtract the hundreds column = 1 – 1 = 0 hundreds.

Question 5.

845 – 378

Answer:

467

Explanation:

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

2. Subtract the one’s column. Here 8 > 5 so we cannot subtract 5 from 8. Therefore regroup 4 tens and 5 ones = 13 tens and 15 ones.

Subtract 15 – 8 = 7 ones.

3. Now subtract the tens column. 13 – 7 = 6 tens.

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

Question 6.

555 – 428

Answer:

127

Explanation:

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

2. Subtract the one’s column. Here 8 > 5 so we cannot subtract 8 from 5. Therefore regroup 5 tens and 5 ones = 4 tens and 15 ones.

Subtract 15 – 8 = 7 ones.

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

4. Next subtract the hundreds column = 5 – 4 = 1 hundreds.

**Talk Math** How is rewriting three-digit subtraction different than when you rewrite two-digit subtraction?

Answer:

In three-digit subtraction, there will be ones, tens, and hundreds of places but in two-digit subtraction, there will be only ones and tens places to subtract.

Explanation:

We can explain the difference between subtraction by using a figure.

1. Start with the one’s place. Subtract 8 – 6 = 2.

2. Go to the tens place and subtract those digits. 8 – 2 = 6

3. Now subtract the hundreds place 7 – 5 = 2. The answer to this problem is 262.

**On My Own**

**Rewrite the problem. Subtract.**

Question 7.

363 – 278

Answer:

85

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 3 from 8. Therefore regroup 6 tens and 3 ones = 15 tens and 13 ones.

Subtract 13 – 8 = 5 ones.

3. Now subtract the tens column. 15 – 7 = 8 tens.

4. Next subtract the hundreds column = 2 – 2 = 0 hundreds

Question 8.

285 – 185

Answer:

100

Explanation:

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

2. Subtract the one’s column. Subtract 5 – 5 = 0

3. Now subtract the tens column. 8 – 8 = 0 tens.

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

Question 9.

634 – 175

Answer:

459

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 4 from 5. Therefore regroup 3 tens and 4 ones = 12 tens and 14 ones.

Subtract 14 – 5 = 9 ones.

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

4 Next subtract the hundreds column = 5 – 1 = 4 hundreds

Question 10.

375 – 142

Answer:

233

Explanation:

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

2. Subtract the one’s column. Subtract 5 – 2 = 3 ones.

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

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

Question 11.

825 – 195

Answer:

630

Explanation:

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

2. Subtract the one’s column. Subtract 5 – 5 = 0.

3. Now subtract the tens column. Here 9 > 2 so we cannot subtract 9 from 2. Therefore regroup 7 hundred and 12 tens = 7 hundred and 12 tens. Subtract 12 – 9 = 3 tens.

4. Next subtract the hundreds column = 7 – 1 = 6 hundreds.

Question 12.

647 – 373

Answer:

274

Explanation:

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

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

3. Now subtract the tens column. Here 7 > 4 so we cannot subtract 7 from 3. Therefore regroup 5 hundred and 4 tens = 5 hundred and 14 tens. Subtract 14 – 7 = 7 tens.

4. Next subtract the hundreds column = 5 – 3 = 2 hundreds

Question 13.

695 – 295

Answer:

400

Explanation:

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

2. Subtract the one’s column. Subtract 5 – 5 = 0 ones.

3. Now subtract the tens column. 9 – 9 = 0 tens.

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

Question 14.

853 – 259

Answer:

594

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 5 tens and 3 ones = 14 tens and 13 ones.

Subtract 13 – 9 = 4 ones.

3. Now subtract the tens column. 14 – 5 = 9 tens.

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

Question 15.

496 – 349

Answer:

147

Explanation:

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

2. Subtract the one’s column. Here 9 > 6 so we cannot subtract 9 from 6. Therefore regroup 8 tens and 16 ones = 8 tens and 16 ones.

Subtract 16 – 9 = 7 ones.

3. Now subtract the tens column. 8 – 4 = 4 tens.

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

Question 16.

495 – 267

Answer:

228

Explanation:

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

2. Subtract the one’s column. Here 7 > 5 so we cannot subtract 7 from 5. Therefore regroup 9 tens and 5 ones = 8 tens and 15 ones.

Subtract 15 – 7 = 8 ones.

3. Now subtract the tens column. 8 – 6 = 2 tens.

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

Question 17.

845 – 264

Answer:

581

Explanation:

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

2. Subtract the one’s column. Subtract 5 – 4 = 1 ones.

3. Now subtract the tens column. Here 6 > 4 so we cannot subtract 5 from 4. Therefore regroup 4 hundred and 8 tens = 7 hundred and 14 tens. Subtract 14 – 6 = 8 tens.

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

Question 18.

764 – 375

Answer:

389

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 6 tens and 4 ones = 15 tens and 14 ones.

Subtract 14 – 5 = 9 ones.

3. Now subtract the tens column. 15 – 7 = 8 tens.

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

**Problem Solving**

Question 19.

Lucas is reading a book that is 239 pages long. He has read 159 pages. How many pages does he have left to read?

______________ pages

Answer:

80 pages

Explanation:

Given,

The number of pages Lucas has to read is 239.

He has read 159 pages.

The difference between them gives the number of pages he has left to read.

239 – 159 = 80

Hence there are 80 pages left to read.

Question 20.

Our class read 753 books over the summer. The girls read 394 books. How many books did the boys read?

_____________ books

Answer:

359 books.

Explanation:

Given,

There are 753 books over the summer.

The girls read 394 books.

The difference between the books is 753 – 394 = 359 books.

Question 21.

Our school library has 125 books about pets. I have read 96 of the books. How many books do I have left to read?

______________ books

Answer:

29 books

Explanation:

Given,

In the school library, there are 125 books about pets.

He read 96 of the books.

125 – 96 = 29 books.

Hence there are 29 books left to read.

**Write Math** Explain how you rewrite three-digit subtraction problems to solve.

Answer:

Let us take the example of three-digit subtraction. Now solve the problem.

Explanation:

1. Start with the one’s place. Subtract 3 – 3 = 0.

2. Go to the tens place and subtract those digits. 8 – 7 = 1

3. Now subtract the hundreds place 4 – 3 = 1. The answer for this problem is 110.

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

**Practice**

**Rewrite the problem. Subtract.**

Question 1.

724 – 235

Answer:

489

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 2 tens and 4 ones = 11 tens and 14 ones.

Subtract 14 – 5 = 9 ones.

3. Now subtract the tens column. 11 – 2 = 8 tens.

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

hundreds.

Question 2.

616 – 337

Answer:

279

Explanation:

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

2. Subtract the one’s column. Here 7 > 6 so we cannot subtract 7 from 6. Therefore regroup 1 ten and 6 ones = 10 tens and 16 ones.

Subtract 16 – 7 = 9 ones.

3. Now subtract the tens column. 10 – 3 = 7 tens.

4 Next subtract the hundreds column = 5 – 3 = 2 hundreds

Question 3.

374 – 286

Answer:

88

Explanation:

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

2. Subtract the one’s column. Here 6 > 4 so we cannot subtract 6 from 4. Therefore regroup 7 tens and 4 ones = 16 tens and 14 ones.

Subtract 14 – 6 = 8 ones.

3. Now subtract the tens column. 16 – 8 = 8 tens.

4 Next subtract the hundreds column = 2 – 2 = 0 hundreds

Question 4.

875 – 596

Answer:

279

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 = 16 tens and 15 ones.

Subtract 15 – 6 = 9 ones.

3. Now subtract the tens column. 16 – 9 = 7 tens.

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

Question 5.

945 – 387

Answer:

558

Explanation:

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

2. Subtract the one’s column. Here 7> 5 so we cannot subtract 7 from 5. Therefore regroup 4 tens and 5 ones = 13 tens and 15 ones.

Subtract 15 – 7 = 8 ones.

3. Now subtract the tens column. 13 – 8 = 5 tens.

4 Next subtract the hundreds column = 8 – 3 = 5 hundreds

Question 6.

435 – 294

Answer:

141

Explanation:

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

2. Subtract the one’s column. Subtract 5 – 4 = 1 ones.

3. Now subtract the tens column. Here 9 > 3 so we cannot subtract 9 from 3. Therefore regroup 4 hundred and 3 tens = 4 hundred and 3 tens. Subtract 13 – 9 = 4 tens.

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

**Rewrite the problem. Subtract.**

Question 7.

162 – 89

Answer:

73

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 = 15 tens and 12 ones.

Subtract 12 – 9 = 3 ones.

3. Now subtract the tens column. 15 – 8 = 7 tens.

Question 8.

619 – 254

Answer:

365

Explanation:

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

2. Subtract the one’s column. Subtract 9 – 4 = 5

3. Now subtract the tens column. Here 5 > 1 so we cannot subtract 5 from 1. Therefore regroup 6 hundred and 1 tens = 5 hundred and 11 one. Subtract 11 – 5 = 6 tens.

4. Next subtract the hundreds column = 5 – 2 = 3 hundreds.

Question 9.

195 – 99

Answer:

96

Explanation:

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

2. Subtract the one’s column. Here 9 > 5 so we cannot subtract 5 from 9. Therefore regroup 9 tens and 5 ones = 18 tens and 15 ones.

Subtract 15 – 9 = 6 ones.

3. Now subtract the tens column. 18 – 9 = 9 tens. Hence the answer is 96.

Question 10.

835 people are on o boat. 295 people get off of the boot. How many people are still on the boat?

_____________ people

Answer:

540 people.

Explanation:

There are 835 people on a boat.

There are 295 people who got off the boat.

The difference between the given people gives the number of people still on the boat.

835 – 295 = 540 people.

**Test Practice**

Question 11.

Which problem shows how to rewrite the problem?

368 – 179 = _____________

Answer:

189

Explanation:

The problem that shows to rewrite the problem is 368 – 179 = 189.

**Math at Home** Write a three-digit subtraction number sentence for your child. Have him or her rewrite the number sentence vertically and then subtract.

Answer:

Explanation:

1. Start with the one’s place. Subtract 6 – 3 = 3.

2. Go to the tens place and subtract those digits. 8 – 5 = 3

3. Now subtract the hundreds place 6 – 4 = 2