Percent Equations

Solving Percent Equations Three types of problems What is 50% of 20? 10 is 50% of what? What percent of 20 is 10?

Three types of problems

What is 50% of 20?

10 is 50% of what?

What percent of 20 is 10?

Solving Percent Equations In an equation: What do we represent the is with? = What do we represent the of with? x What do we represent the what with? a variable

In an equation:

What do we represent the is with?

=

What do we represent the of with?

x

What do we represent the what with?

a variable

Solving Percent Equations Simple equation that always works:

Simple equation that always works:

Solving Percent Equations 15 is what percent of 12? Cross multiply and divide to find the answer.

15 is what percent of 12?

Cross multiply and divide to find the answer.

Solving Percent Equations (15 x 100)/12 = 125

(15 x 100)/12 =

125

Solving Percent Equations What is 15% of 12? Cross multiply and divide

What is 15% of 12?

Cross multiply and divide

Solving Percent Equations (15 x 12)/100 1.8

(15 x 12)/100

1.8

Solving Percent Equations 12 is 15% of what? Cross multiply and divide

12 is 15% of what?

Cross multiply and divide

Solving Percent Equations (12x100)/15 80

(12x100)/15

80

Solving Percent Equations Practice: What is 4% of 150? What % of 51 is 17? 6% of what is 36? Answers: 6 33 1/3 % 600

Practice:

What is 4% of 150?

What % of 51 is 17?

6% of what is 36?

Answers:

6

33 1/3 %

600