Solving Percent Problems

Is Over Of Equals Percent Over 100

or

Part Over Whole Equals Percent Over 100

Helps us solve percent problems

45% of what is 9?

9  =  45

x     100

(9 times 100 ) divided by 45

x = 20

What is 35% of 80?

x  =  35

80   100

(80 times 35) divided by 100

x =28

What is a 20% tip of $30

tip  =   20

30      100

(30 times 20) divided by 100

Tip = $6

There are 15 girls in the class. That is 75 percent of the students. 

How many students are in the class.

15  =  75

x     100

(15 times 100) divided by 75

There are 20 students in the class

How many boys are in the class?

20 subtract 15 = 5 boys