Chapter 6.CM, Problem 1CM

Subtract. Check each answer by adding.

a. $12- 9$

b. $22-7$

c. $35-35$

d. $70-0$

To determine

a. To find:

The value of 12 – 9.

Answer to Problem 1CM

Solution:

3

Explanation of Solution

Approach:

1) Subtract the numbers.

2) Test the result by adding.

Calculation:

$12-9=3$

Test:

Add 9 and 3

$9+3=12$

Final statement:

$12–9=3$

To determine

b. To find:

The value of $22–7$.

Answer to Problem 1CM

Solution:

15

Explanation of Solution

Approach:

1) Subtract the numbers.

2) Test the result by adding.

Calculation:

$22–7=15$

Test:

Add 7 and 15

$7+15=22$

Final statement:

$22–7=15$

To determine

c. To find:

The value of $35–35$.

Answer to Problem 1CM

Solution:

0

Explanation of Solution

Approach:

1) Subtract the numbers.

2) Test the result by adding.

Calculation:

$35–35=0$

Test:

Add 35 and 0

$35+0=35$

Final statement:

$35–35=$ 0

To determine

d. To find:

The value of $70–0$.

Answer to Problem 1CM

Solution:

70

Explanation of Solution

Approach:

1) Subtract the numbers.

2) Test the result by adding.

Calculation:

$70–0=70$

Test:

Add 0 and 70

$0+70=70$

Final statement:

$70–0=70$