Solving Multiplication and Division Equations

Lesson 2-7

Procedure

• Isolate the variable by performing the inverse operation on the number that is attached to the variable.

• The inverse of multiplication is division. The inverse of division is multiplication.

• Use the “Golden Rule.” Perform the same operation on the other side of the equal sign.

Example

m ÷ 3 = 10The inverse of division is multiplication. x 3Repeat the operation on the other side.

x 3

m = 30

Check. Use the original equation.m ÷ 3 = 1030 ÷ 3 = 10

10 = 10

Example 2

7b = 105The inverse of multiplying is dividing.

÷ 7 ÷ 7

b =10571

735

5

350

15

Check

7b = 1057(15) = 105

105 = 105

Homework Time