All the solutions provided in **McGraw Hill My Math Grade 2 Answer Key PDF Chapter 7 Lesson 6 Subtract Three-Digit Numbers **will give you a clear idea of the concepts.

## McGraw-Hill My Math Grade 2 Answer Key Chapter 7 Lesson 6 Subtract Three-Digit Numbers

**Explore and Explain**

______________ students

**Teacher Directions:** Use base-ten blocks to solve. 355 students are eating lunch in the cafeteria. 166 students packed their lunch. How many students bought their lunch? Draw the blocks Write the number.

Answer:

355 – 166 = 189 students.

Explanation:

Given,

There are 355 students eating lunch in the cafeteria.

166 students packed their lunch.

The difference between them is 355 – 166 = 189 students.

Hence there are 189 students bought their lunch.

**See and Show**

Find 634 – 159.

Step 1:

Subtract the ones. You cannot subtract 9 ones from 4 ones. Regroup 1 ten as 10 ones.

Step 2:

Subtract the tens. You cannot subtract 5 tens from 2 tens. Regroup 1 hundred as 10 tens.

Step 3: Subtract the hundreds. Now you can subtract 1 hundred from 5 hundreds.

**Talk Math** Explain what you write in the box above the ones and the box above the tens when you regroup tens and hundreds.

Answer:

**On My Own**

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

Question 1.

Answer:

86

Explanation:

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

2. Subtract the one’s column. Here 1 > 5 so we cannot subtract 5 from 1. Therefore regroup 3 tens and 1 ones = 12 tens and 11 ones.

Subtract 11 – 5 = 6 ones.

3. Now subtract the tens column. 12 – 4 = 8 tens.

4 Next subtract the hundreds column 3 – 3 = 0 hundred. Hence the answer is 86.

Question 2.

Answer:

674

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 = 15 tens and 12 ones.

Subtract 12 – 8 = 4 ones.

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

4. Now bring down the remaining 6. Then the answer is 674.

Question 3.

Answer:

189

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 3 from 4. Therefore regroup 5 tens and 3 ones = 14 tens and 13 ones.

Subtract 13 – 4 = 9 ones.

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

4. Next subtract the hundreds column = 8 – 7 = 1 hundred.

Question 4.

Answer:

491

Explanation:

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

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

3. Now subtract the tens column. Here 1 > 0 so we cannot subtract 0 from 1. Therefore regroup 7 hundred and 0 tens = 6 hundred and 10 tens. Subtract 10 – 1 = 9 tens.

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

Question 5.

Answer:

687

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 4 from 7. Therefore regroup 8 tens and 4 ones = 17 tens and 14 ones.

Subtract 14 – 7 = 7 ones.

3. Now subtract the tens column. 17 – 9 = 8 tens.

4. Next subtract the hundreds column = 7 – 1 = 6 hundreds. Hence the answer is 687.

Question 6.

Answer:

188

Explanation:

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

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

Subtract 12 – 4 = 8 ones.

3. Now subtract the tens column. 12 – 4 = 8 tens.

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

Question 7.

Answer:

189

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 = 17 tens and 15 ones.

Subtract 15 – 6 = 9 ones.

3. Now subtract the tens column. 17 – 9 = 8 tens.

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

Question 8.

Answer:

188

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 hundred. The answer is 188.

Question 9.

Answer:

187

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 2 tens and 5 ones = 11 tens and 15 ones.

Subtract 15 – 8 = 7 ones.

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

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

Question 10.

Answer:

406

Explanation:

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

2. Subtract the one’s column. Here 4 > 0 so we cannot subtract 0 from 4. Therefore regroup 9 tens and 0 ones = 8 tens and 4 ones.

Subtract 10 – 4 = 6 ones.

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

4. Next subtract the hundreds column = 5 – 1 = 4 hundreds. The answer is 406.

Question 11.

Answer:

90

Explanation:

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

2. Subtract the one’s column. Subtract 8 from 8. The answer is 8 – 8 = 0.

3. Now subtract the tens column. Here 2 > 1 so we cannot subtract 1 from 2. Therefore regroup 7 hundred and 1 one = 6 hundred tens and 11 tens. Subtract 11 – 2 = 9 tens.

4. Next subtract the hundreds column = 6 – 6 = 0 hundred.

Question 12.

Answer:

209

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 8 tens and 14 ones = 8 tens and 14 ones.

Subtract 14 – 5 = 9 ones.

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

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

Question 13.

Answer:

288

Explanation:

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

2. Subtract the one’s column. Here 3 > 1 so we cannot subtract 1 from 3. Therefore regroup 6 tens and 1 one = 15 tens and 11 ones.

Subtract 11 – 3 = 8 ones.

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

4 Next subtract the hundreds column = 4 – 2 = 2 hundred. Hence the answer is 288.

Question 14.

Answer:

539

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 – 9 = 3 tens.

4 Next subtract the hundreds column = 8 – 3 = 5 hundreds. Hence the answer is 539.

Question 15.

Answer:

330

Explanation:

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

2. Subtract the one’s column. Now subtract 3 – 3 = 0.

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

4 Next subtract the hundreds column = 5 – 2 = 3 hundreds. Hence the answer is 330.

**Problem Solving**

Question 16.

The post office had 912 stamps on Friday. By Saturday 189 stamps were left. How many stamps were sold on Friday?

____________ stamps

Answer:

912 – 189 = 723 stamps.

Explanation:

Given,

The post office had 912 stamps on Friday.

By Saturday 189 stamps were left.

The difference between them is 912 – 189 = 723 stamps.

Hence, there are 723 stamps were sold on Friday.

Question 17.

Dakota had 200 plastic bugs. He lost some bugs. He has 155 bugs left. How many bugs did he lose?

_____________ bugs

Answer:

200 – 155 = 45 bugs.

Explanation:

Given,

Dakota had 200 plastic bugs.

He has 155 bugs left.

The difference is 200 – 155 = 45 bugs.

He lost 45 bugs.

Question 18.

There are 350 pieces of popcorn. Ayana and Gabby eat 177 pieces. How many pieces are left?

_____________ pieces

Answer:

350 – 177 = 173 pieces.

Explanation:

Given,

There are 350 pieces of popcorn.

Ayana and Gabby eat 177 pieces

The difference between them is 350 – 177 = 173 pieces are left.

**HOT Problem** 228 students like red. 293 students like blue. 154 students like green. How many more students like red or green than blue? Explain.

Answer:

89 more students like red or green than blue.

Explanation:

Given,

The students who like red are 228.

The students who like blue are 293.

The students who like green are 154

The students who like red and green are the total students that like red and green together

228 + 154 = 382 students

382 – 293 = 89 students.

Hence 89 more students like red or green than blue.

### McGraw Hill My Math Grade 2 Chapter 7 Lesson 6 My Homework Answer Key

**Practice**

**Subtract.**

Question 1.

Answer:

102

Explanation:

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

2. Subtract the one’s column. 3 – 1 = 2

3. Now subtract the tens column. 5 – 5 = 0 tens.

4 Next subtract the hundreds column = 4 – 3 = 1 hundred. Hence the answer is 102.

Question 2.

Answer:

453

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 2 from 9. Therefore regroup 1 ten and 2 ones = 10 tens and 12 ones.

Subtract 12 – 9 = 3 ones.

3. Now subtract the tens column. 10 – 5 = 5 tens.

4 Next subtract the hundreds column = 5 – 1 = 4 hundreds. Hence the answer is 453.

Question 3.

Answer:

511

Explanation:

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

2. Subtract the one’s column. 7 – 6 = 1 ones.

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

4. Now bring down the 5. Hence the answer is 511.

Question 4.

Answer:

356

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 4 from 8. Therefore regroup 3 tens and 4 ones = 12 tens and 14 ones.

Subtract 14 – 8 = 6 ones.

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

4 Next subtract the hundreds column = 6 – 2 = 3 hundreds. The answer is 356.

Question 5.

Answer:

192

Explanation:

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

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

3. Now subtract the tens column. Here 7 > 6 so we cannot subtract 6 from 7. Therefore regroup 3 hundred and 6 tens = 2 hundred and 16 tens. Subtract 16 – 7 = 9 tens.

4. Now subtract the hundreds column = 2 – 1 = 1 hundred. The answer is 192.

Question 6.

Answer:

608

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 4 from 6. Therefore regroup 3 tens and 4 ones = 2 tens and 14 ones.

Subtract 14 – 6 = 8 ones.

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

4. Now bring down the 6. The answer is 6. Hence the answer is 608.

Question 7.

Answer:

96

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 4 from 8. Therefore regroup 6 tens and 4 ones = 15 tens and 14 ones.

Subtract 14 – 8 = 6 ones.

3. Now subtract the tens column. 15 – 6 = 9 tens.

4. Next subtract the hundreds column = 1 – 1 = 0 hundreds. The answer is 96.

Question 8.

Answer:

79

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

Subtract 14 – 5 = 9 ones.

3. Now subtract the tens column. 11 – 4 = 7 tens.

4. Next subtract the hundreds column = 4 – 4 = 0 hundreds. The answer is 79.

Question 9.

Answer:

179

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 7 from 8. Therefore regroup 4 tens and 7 ones = 13 tens and 17 ones.

Subtract 17 – 8 = 9 ones.

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

4. Next subtract the hundreds column = 2 – 1 = 1 hundred. The answer is 179.

Question 10.

344 people are at a game. 198 people leave at half time. How many people are still at the game?

____________ people

Answer:

146 people.

Explanation:

Given,

There are 344 people at a game.

People left at halftime is 198

The difference between the given numbers gives us how many people are still at the game.

344 – 198 = 146 people.

**Test Practice**

Question 11.

Which problem needs to be regrouped twice?

(A) 354 – 134

(B) 367 – 263

(C) 364 – 274

(D) 364 – 278

Answer:

Option D 364 – 278

Explanation:

The problem 364 – 278 needs to be regrouped twice.

**Math at Home** Have your child explain how regrouping tens and hundreds are the same.

Answer: