CPM Homework Help : MC2 Problem 5-7

Write the inverse operations, that is, operations that "undo" one another for each situation below.

Hint:

Addition and subtraction are inverse operations.
For example, adding $4$ and then subtracting $4$ takes you back to your original number.
Multiplication and division are also inverse operations.
For example, multiplying a number by $4$ and then dividing by $4$ takes you back to your original number.

What is the inverse operation for "add $\frac { 3 } { 4 }$ ?"
Answer (a):
$\text{Subtract}\ \frac{3}{4}.$
What is the inverse operation for "subtract $1 \frac { 2 } { 3 }$ ?"
More Help (b):
If subtraction and addition are inverse operations, how much do you have to add?
What is the inverse operation for "divide by $8$ ?"
Answer (c):
Multiply by $8$ .
What is the inverse operation for "multiply by $12$ ?"
More Help (d):
If multiplication and division are inverse operations, how much do you have to divide by?