All the solutions provided in **McGraw Hill My Math Grade 2 Answer Key PDF Chapter 7 Lesson 9 Subtract Across Zeros **will give you a clear idea of the concepts.

## McGraw-Hill My Math Grade 2 Answer Key Chapter 7 Lesson 9 Subtract Across Zeros

**Explore and Explain**

______________ animals

**Teacher Directions:** Model using base-ten blocks. We have learned about 200 different kinds of animals. 126 of those animals were mammals. How many of the animals were not mammals? Draw the blocks. Write the number.

Answer:

74 animals were not mammals.

Explanation:

Given,

There are 200 different kinds of animals.

126 of those animals were mammals.

The difference between the mammals is 200 – 126 = 74

**See and Show**

You can subtract across zeros.

Find 400 – 234.

Step 1: Subtract the ones. You cannot subtract 4 ones from 0 ones. There are no tens to subtract from. Look at the hundreds. Regroup 1 hundred as 10 tens. Then regroup 1 ten as ten ones.

Step 2: Subtract the tens. There are 9 tens left. Subtract 3 tens from 9 tens.

Step 3: Subtract the hundreds. There are 3 hundreds left. Subtract 2 hundreds from 3 hundreds.

**Talk Math** How is subtracting from 400 different than subtracting from 435?

Answer:

**On My Own**

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

Question 1.

Answer:

268

Explanation:

Step 1: Subtract the ones. You cannot subtract 2 ones from 0 ones. There are no tens to subtract from. Look at the hundreds. Regroup 1 hundred as 10 tens. Then regroup 1 ten as ten ones. Subtract 10 – 2 = 8

Step 2: Subtract the tens. There are 9 tens left. Subtract 3 tens from 9 tens. 9 – 3 = 6 tens

Step 3: Subtract the hundreds. There are 7 hundred left. Subtract 5 hundred from 7 hundred. 7 – 5 = 2 hundred.

The answer is 268.

Question 2.

Answer:

86

Explanation:

Step 1: Subtract the ones. You cannot subtract 4 ones from 0 ones. There are no tens to subtract from. Look at the hundreds. Regroup 1 hundred as 10 tens. Then regroup 1 ten as ten ones. Subtract 10 – 4 = 6 ones.

Step 2: Subtract the tens. There are 9 tens left. Subtract 1 ten from 9 tens. Subtract 9 – 1 = 8 tens

Step 3: Subtract the hundreds. There are 6 hundred left. Subtract 6 hundred from 6 hundred. 6 – 6 = 0 hundred.

The answer is 86.

Question 3.

Answer:

24

Explanation:

Step 1: Subtract the ones. You cannot subtract 6 ones from 0 ones. There are no tens to subtract from. Look at the hundreds. Regroup 1 hundred as 10 tens. Then regroup 1 ten as ten ones. 10 – 6 = 4 ones.

Step 2: Subtract the tens. There are 9 tens left. Subtract 7 tens from 9 tens. 9 – 7 = 2

The answer is 24.

Question 4.

Answer:

613

Explanation:

Step 1: Subtract the ones. You cannot subtract 7 ones from 0 ones. There are no tens to subtract from. Look at the hundreds. Regroup 1 hundred as 10 tens. Then regroup 1 ten as ten ones. 10 – 7 = 2 ones.

Step 2: Subtract the tens. There are 9 tens left. Subtract 8 tens from 9 tens. 9 – 8 = 1 tens.

Step 3: Subtract the hundreds. There are 8 hundred left. Subtract 2 hundred from 8 hundred. 8 – 2 = 6 hundred.

The answer is 613.

Question 5.

Answer:

233.

Explanation:

Step 1: Subtract the ones. You cannot subtract 7 ones from 0 ones. There are no tens to subtract from. Look at the hundreds. Regroup 1 hundred as 10 tens. Then regroup 1 ten as ten ones. 10 – 7 = 3 ones

Step 2: Subtract the tens. There are 9 tens left. Subtract 6 tens from 9 tens. 9 – 6 = 3 tens.

Step 3: Subtract the hundreds. There are 3 hundred left. Subtract 1 hundred from 3 hundred. 3 – 1 = 2 hundred.

The answer is 233.

Question 6.

Answer:

256

Explanation:

Step 1: Subtract the ones. You cannot subtract 4 ones from 0 ones. There are no tens to subtract from. Look at the hundreds. Regroup 1 hundred as 10 tens. Then regroup 1 ten as ten ones. 10 – 4 = 6 ones.

Step 2: Subtract the tens. There are 9 tens left. Subtract 4 tens from 9 tens. 9 – 4 = 5 tens.

Step 3: Subtract the hundreds. There are 6 hundred left. Subtract 4 hundred from 6 hundred. 6 – 4= 2

The answer is 256.

Question 7.

Answer:

284

Explanation:

Step 1: Subtract the ones. You cannot subtract 6 ones from 0 ones. There are no tens to subtract from. Look at the hundreds. Regroup 1 hundred as 10 tens. Then regroup 1 ten as ten ones. 10 – 6 = 4 ones.

Step 2: Subtract the tens. There are 9 tens left. Subtract 1 ten from 9 tens. 9 – 1 = 8 tens.

Step 3: There are 2 hundred. The answer is 284.

Question 8.

Answer:

323.

Explanation:

Step 1: Subtract the ones. You cannot subtract 7 ones from 0 ones. There are no tens to subtract from. Look at the hundreds. Regroup 1 hundred as 10 tens. Then regroup 1 ten as ten ones. 10 – 7 = 3 ones.

Step 2: Subtract the tens. There are 9 tens left. Subtract 7 tens from 9 tens. 9 – 7 = 2 tens.

Step 3: Subtract the hundreds. There are 7 hundred left. Subtract 4 hundred from 7 hundred. 7 – 4 = 3 hundred.

The answer is 323.

Question 9.

Answer:

24

Explanation:

Step 1: Subtract the ones. You cannot subtract 6 ones from 0 ones. There are no tens to subtract from. Look at the hundreds. Regroup 1 hundred as 10 tens. Then regroup 1 ten as ten ones. 10 – 6 = 4 ones.

Step 2: Subtract the tens. There are 9 tens left. Subtract 7 tens from 9 tens. 9 – 7 = 2 tens.

Step 3: Subtract the hundreds. There are 8 hundred left. Subtract 8 hundred from 8 hundred. 8 – 8 = 0. The answer is 24.

Question 10.

Answer:

446

Explanation:

Step 1: Subtract the ones. You cannot subtract 4 ones from 0 ones. There are no tens to subtract from. Look at the hundreds. Regroup 1 hundred as 10 tens. Then regroup 1 ten as ten ones. 10 – 4 = 6 ones.

Step 2: Subtract the tens. There are 9 tens left. Subtract 5 tens from 9 tens. 9 – 5 = 4

Step 3: There are 4 hundred left. The answer is 446.

Question 11.

Answer:

109

Explanation:

Step 1: Subtract the ones. You cannot subtract 1 one from 0 ones. There are no tens to subtract from. Look at the hundreds. Regroup 1 hundred as 10 tens. Then regroup 1 ten as ten ones. 10 – 1 = 9

Step 2: Subtract the tens. There are 9 tens left. Subtract 9 tens from 9 tens. 9 – 9 = 0 tens.

Step 3: Subtract the hundreds. There are 7 hundred left. Subtract 6 hundred from 7 hundred. 7 – 6 = 1. The answer is 109.

Question 12.

Answer:

125

Explanation:

Step 1: Subtract the ones. You cannot subtract 5 ones from 0 ones. There are no tens to subtract from. Look at the hundreds. Regroup 1 hundred as 10 tens. Then regroup 1 ten as ten ones. 10 – 5 = 5 ones.

Step 2: Subtract the tens. There are 9 tens left. Subtract 5 tens from 9 tens. 9 – 7 = 2 tens.

Step 3: There are 1 hundred left. The answer is 125.

Question 13.

Answer:

179

Explanation:

Step 1: Subtract the ones. You cannot subtract 1 one from 0 ones. There are no tens to subtract from. Look at the hundreds. Regroup 1 hundred as 10 tens. Then regroup 1 ten as ten ones. 10 – 1 = 9 ones.

Step 2: Subtract the tens. There are 9 tens left. Subtract 2 tens from 9 tens. 9 – 2 = 7 tens.

Step 3: Subtract the hundreds. There are 4 hundred left. Subtract 3 hundred from 4 hundred. 4 – 3 = 1 hundred.

Question 14.

Answer:

288

Explanation:

Step 1: Subtract the ones. You cannot subtract 2 ones from 0 ones. There are no tens to subtract from. Look at the hundreds. Regroup 1 hundred as 10 tens. Then regroup 1 ten as ten ones. 10 – 2 = 8 ones.

Step 2: Subtract the tens. There are 9 tens left. Subtract 1 ten from 9 tens. 9 – 1 = 8 tens.

Step 3: Subtract the hundreds. There are 5 hundred left. Subtract 3 hundred from 5 hundred. 5 – 3 = 2

**Problem Solving**

Question 15.

400 bees are in the hive. 145 bees leave the hive. How many bees are still in the hive?

____________ bees

Answer:

There are 355 bees are there in the hive.

Explanation:

Given,

There are 400 bees in the hive.

145 bees leave the hive.

The difference between them gives the bees that are still in the hive.

400 – 145 = 355

Question 16.

300 girls took gymnastics last year. This year 193 girls take gymnastics. How many more girls took gymnastics last year than this year?

_____________ girls

Answer:

107 girls.

Explanation:

Given,

The girls who took gymnastics last year are 300.

This year 193 girls take gymnastics.

The difference between them is 300 – 193 = 107 girls.

**HOT Problem** 500 people signed up for soccer. 123 people stopped playing. Then 154 more people stopped playing. How many people still play soccer? Explain.

Answer:

223 people still play soccer.

Explanation:

Given,

The number of people signed up for soccer is 500.

The people who stopped playing are 123.

More people stopped playing are 154

The total number of people who stopped playing is 123 + 154 = 277

The difference between the number of people and the people who stopped playing is 500 – 277 = 223 people

### McGraw Hill My Math Grade 2 Chapter 7 Lesson 9 My Homework Answer Key

**Practice**

**Subtract.**

Question 1.

Answer:

49

Explanation:

Step 1: Subtract the ones. You cannot subtract 1 one from 0 ones. There are no tens to subtract from. Look at the hundreds. Regroup 1 hundred as 10 tens. Then regroup 1 ten as ten ones. 10 – 1 = 9 ones.

Step 2: Subtract the tens. There are 9 tens left. Subtract 5 tens from 9 tens. 9 – 5 = 4 tens.

Step 3: There are 2 hundred left. Subtract 2 hundred from 2 hundred. The answer is 0.

The subtraction of the given numbers is 49.

Question 2.

Answer:

461

Explanation:

Step 1: Subtract the ones. You cannot subtract 1 one from 0 ones. There are no tens to subtract from. Look at the hundreds. Regroup 1 hundred as 10 tens. Then regroup 1 ten as ten ones. 10 – 9 = 1 ones.

Step 2: Subtract the tens. There are 9 tens left. Subtract 3 tens from 9 tens. 9 – 3 = 6 tens.

Step 3: Subtract the hundreds. There are 5 hundred left. Subtract 1 hundred from 5 hundred. 5 – 1 = 4 hundred.

Question 3.

Answer:

314

Explanation:

Step 1: Subtract the ones. You cannot subtract 1 one from 0 ones. There are no tens to subtract from. Look at the hundreds. Regroup 1 hundred as 10 tens. Then regroup 1 ten as ten ones.

Step 2: Subtract the tens. There are 9 tens left. Subtract 8 tens from 9 tens.

Step 3: Subtract the hundreds. There are 6 hundred left. Subtract 3 hundred from 6 hundred.

Question 4.

Answer:

74

Explanation:

Step 1: Subtract the ones. You cannot subtract 1 one from 0 ones. There are no tens to subtract from. Look at the hundreds. Regroup 1 hundred as 10 tens. Then regroup 1 ten as ten ones.

Step 2: Subtract the tens. There are 9 tens left. Subtract 2 tens from 9 tens.

Step 3: Subtract the hundreds. There are 1 hundred left. Subtract 1 hundred from 1 hundred. The answer is zero.

The subtraction of the two given numbers is 74.

Question 5.

Answer:

115

Explanation:

Step 1: Subtract the ones. You cannot subtract 1 one from 0 ones. There are no tens to subtract from. Look at the hundreds. Regroup 1 hundred as 10 tens. Then regroup 1 ten as ten ones.

Step 2: Subtract the tens. There are 9 tens left. Subtract 8 tens from 9 tens.

Step 3: Subtract the hundreds. There are 4 hundred left. Subtract 3 hundred from 4 hundred.

Question 6.

Answer:

528

Explanation:

Step 1: Subtract the ones. You cannot subtract 1 one from 0 ones. There are no tens to subtract from. Look at the hundreds. Regroup 1 hundred as 10 tens. Then regroup 1 ten as ten ones.

Step 2: Subtract the tens. There are 9 tens left. Subtract 7 tens from 9 tens.

Step 3: Subtract the hundreds. There are 7 hundred left. Subtract 2 hundred from 7 hundred.

Question 7.

100 – 89

Answer:

11

Explanation:

Step 1: Subtract the ones. You cannot subtract 1 one from 0 ones. There are no tens to subtract from. Look at the hundreds. Regroup 1 hundred as 10 tens. Then regroup 1 ten as ten ones.

Step 2: Subtract the tens. There are 9 tens left. Subtract 8 tens from 9 tens.

The subtraction of the given two numbers is 11.

Question 8.

600 – 564

Answer:

36

Explanation:

Step 1: Subtract the ones. You cannot subtract 1 one from 0 ones. There are no tens to subtract from. Look at the hundreds. Regroup 1 hundred as 10 tens. Then regroup 1 ten as ten ones.

Step 2: Subtract the tens. There are 9 tens left. Subtract 6 tens from 9 tens.

Step 3: Subtract the hundreds. There are 5 hundred left. Subtract 5 hundred from 5 hundred.

Question 9.

500 – 268

Answer:

232

Explanation:

Step 1: Subtract the ones. You cannot subtract 1 one from 0 ones. There are no tens to subtract from. Look at the hundreds. Regroup 1 hundred as 10 tens. Then regroup 1 ten as ten ones.

Step 2: Subtract the tens. There are 9 tens left. Subtract 6 tens from 9 tens.

Step 3: Subtract the hundreds. There are 4 hundred left. Subtract 2 hundred from 4 hundred.

Question 10.

Answer:

468

Explanation:

Step 1: Subtract the ones. You cannot subtract 1 one from 0 ones. There are no tens to subtract from. Look at the hundreds. Regroup 1 hundred as 10 tens. Then regroup 1 ten as ten ones.

Step 2: Subtract the tens. There are 9 tens left. Subtract 2 tens from 9 tens.

Step 3: Subtract the hundreds. There are 8 hundred left. Subtract 4 hundred from 8 hundred.

Question 11.

Answer:

336

Explanation:

Step 1: Subtract the ones. You cannot subtract 1 one from 0 ones. There are no tens to subtract from. Look at the hundreds. Regroup 1 hundred as 10 tens. Then regroup 1 ten as ten ones.

Step 2: Subtract the tens. There are 9 tens left. Subtract 6 tens from 9 tens.

Step 3: Subtract the hundreds. There are 6 hundred left. Subtract 3 hundred from 6 hundred.

Question 12.

Answer:

53

Explanation:

Step 1: Subtract the ones. You cannot subtract 1 one from 0 ones. There are no tens to subtract from. Look at the hundreds. Regroup 1 hundred as 10 tens. Then regroup 1 ten as ten ones.

Step 2: Subtract the tens. There are 9 tens left. Subtract 4 tens from 9 tens.

Step 3: Subtract the hundreds. There are 1 hundred left. Subtract 1 hundred from 1 hundred.

Question 13.

400 pineapples are planted in a row. 293 pineapples get picked. How many pineapples are still in the row?

_____________ pineapples

Answer:

400 – 293 = 107 pineapples.

Explanation:

Given,

Pineapples planted in a row = 400

293 pineapples get picked

The difference between pineapples picked and planted is 400 – 293 = 107

Therefore 107 pineapples are still in the row.

**Test Practice**

Question 14.

Find 600 – 289.

(A) 889

(B) 311

(C) 301

(D) 489

Answer:

311

Explanation:

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

2. Subtract the one’s column. Here 9 > 0 so we cannot subtract 9 from 0. Therefore regroup 0 tens and 0 ones = 9 tens and 10 ones.

Subtract 10 – 9 = 1 ones.

3. Now subtract the tens column. 9 – 8 = 1 tens.

4. Next subtract the hundreds column = 5 – 2 = 3 hundred. The answer is 311.

**Math at Home** Have your child explain how to subtract 392 from 800.

Answer:

408

Explanation:

Step 1: Subtract the ones. You cannot subtract 1 one from 0 ones. There are no tens to subtract from. Look at the hundreds. Regroup 1 hundred as 10 tens. Then regroup 1 ten as ten ones.

Step 2: Subtract the tens. There are 9 tens left. Subtract 9 tens from 9 tens.

Step 3: Subtract the hundreds. There are 7 hundred left. Subtract 3 hundred from 7 hundred.

The subtraction of the given number 800 – 392 = 408