All the solutions provided inÂ **McGraw Hill My Math Grade 1 Answer Key PDF Chapter 6 Review **will give you a clear idea of the concepts.

## McGraw-Hill My Math Grade 1 Chapter 6 Review Answer Key

**Vocabulary Check**

**Complete each sentence.**

difference

ones

subtract

sum

tens

Question 1.

The answer to an addition problem is called the ________________.

Answer:

The answer to an addition problem is called the sum.

Question 2.

In the number 63, 6 is in the ______________ place.

Answer:

In the number 63, 6 is in the tens place.

Question 3.

You ______________ to find the difference.

Answer:

You subtract to find the difference.

Question 4.

The answer to a subtraction problem is called the _______________.

Answer:

The answer to a subtraction problem is called the difference.

Question 5.

In the number 72, 2 is in the _______________ place.

Answer:

In the number 72, 2 is in the ones place.

**Concept Check**

**Add.**

Question 6.

2 tens + 1 ten = ____________ tens

20 + 10 = ______________

Answer:

Explanation:

2 tens + 1 ten = 3 tens

20 + 10 = 30.

Question 7.

6 tens + 3 tens = _______________ tens

60 + 30 = _______________

Answer:

Explanation:

6 tens + 3 tens = 9 tens

60 + 30 = 90.

**Count on to Add. Write the sum.**

Question 8.

75 + 1 = ______________

Answer:

76

Explanation:

75 = 7 tens 5 ones

Add ones

5 ones + 1 one = 6 ones

The sum is 7 tens and 6 ones that is 76.

Question 9.

36 + 3 = _______________

Answer:

39

Explanation:

36 = 3 tens + 6 ones

Add ones

6 ones + 3 ones = 9 ones

The sum is 3 tens and 9 ones that is 39.

**Add.**

Question 10.

Answer:

Explanation:

The sum of 62 and 3 is 65.

Question 11.

Answer:

Explanation:

The sum of 37 an d2 is 39.

Question 12.

Answer:

Explanation:

The sum of 54 and 4 is 58.

**Subtract.**

Question 13.

6 tens – 2 tens = ____________ tens

60 – 20 = _______________

Answer:

Explanation:

6 tens – 2 tens = 4 tens

60 – 20 = 40.

Question 14.

5 tens – 2 tens = ____________ tens

50 – 20 = ____________

Answer:

Explanation:

5 tens – 2 tens = 3 tens

50 – 20 = 30.

**Use the number line to help you subtract.**

Question 15.

80 – 30 = _____________

Answer:

Explanation:

Use a number line to subtract numbers by tens

Start at 80

Count back by tens to find the difference 70, 60, 50

So, 80 – 30 = 50.

Question 16.

90 – 20 = ______________

Answer:

Explanation:

Use a number line to subtract numbers by tens

Start at 90

Count back by tens to find the difference 80, 70

So, 90 – 20 = 50.

**Problem Solving**

**Use the number line to help you subtract.**

Question 17.

Cameron has 60 marbles. Eric borrows 30 of them. How many marbles does Cameron have left?

______________ marbles

Answer:

Explanation:

Cameron has 60 marbles

Eric borrows 30 of them

Use a number line to subtract numbers by tens

Start at 60

Count back by tens to find the difference 50, 40, 30

So, 60 – 30 = 30

Therefore, Cameron have 30 marbles left.

**Subtract. Write the related addition fact.**

Question 18.

Sam drew 40 pictures. He gave 20 of them to his dad. How many pictures does Sam have left?

_____________ – ______________ = ______________

_____________ + ______________ = ______________

Answer:

Explanation:

Sam drew 40 pictures

He gave 20 of them to his dad

Sam drew 40 pictures

He gave 20 of them to his dad

40 – 20 = 20 is the subtraction number sentence

So, Sam have 20 pictures left with him

The related addition fact is 20 + 20 = 40.

**Test Practice**

Question 19.

There are 25 people at a park. 3 more people come to the park. How many people are at the park in all?

(A) 22 people

(B) 27 people

(C) 28 people

(D) 55 people

Answer:

(C) 28 people

Explanation:

There are 25 people at a park

3 more people come to the park

25 = 2 tens 5 ones

Add ones

5 ones + 3 ones = 8 ones

So, the sum is 2 tens and 8 ones that is 28.

**Reflect**

Add. Explain your work.

Answer:

Explanation:

The sum of 62 and 3 is 65.

Subtract. Explain your work.

8 tens – 3 tens = _____________ tens

80 – 30 = _______________

Answer:

Explanation:

8 tens – 3 tens = 5 tens

80 – 30 = 50.