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

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.
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 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 – 264 113

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 – 265 368

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 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 – 378 467

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 – 428 127

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?
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 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 – 185 100

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 – 175 459

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 – 142 233

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 – 195 630

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 – 373 274

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 – 295 400

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 – 259 594

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 – 349 147

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 – 267 228

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 – 264 581

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 – 375 389

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
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
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
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.
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 – 235 489

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 – 337 279

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 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 – 596 279

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 – 387 558

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 – 294 141

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 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 – 254 365

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 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
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 = _____________ 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. 