Solving Equations Solving Equations Containing PercentsContaining Percents

Percent Proportion MethodPercent Proportion Method Part = % Whole 100

Example: What is 25% of 20?

x = 25 You are trying to

20 100 find a “part” of 20

Proportion MethodProportion MethodExample: What is 18% of 56?

Part = % Whole 100%

x = 18% You are trying to

56 100% find a “part” of 56

Proportion MethodProportion MethodExample: 45 is what percent of 90?

Part = % Whole 100%

45 = x% You are trying to

90 100% find a percent

Proportion MethodProportion Method12 is 8% of what number?

Part = % Whole 100%

12 = 8% You are trying to

x 100% find the “whole” number

Proportion MethodProportion MethodWhat is 10% of 40?

Proportion MethodProportion MethodWhat is 30% of 62?

Proportion MethodProportion Method48 is 20% of what number?

Equation MethodEquation MethodWhat is 30% of 80?

n = 30% • 80

n = 0.30 • 80 REMEMBER to change

into a decimal!

n = 24

Equation MethodEquation Method105 is what percent of 75?

105 = n • 75

105 = n•75 105 = 75n 75 75 1.4 = 140% = n REMEMBER to change into a

percent!

Equation MethodEquation Method6 is 10% of what number?

6 = 10% • n

6 = 0.10 • n REMEMBER to change

6 = 0.10n 0.10 0.10

60 = n

Equation MethodEquation MethodWhat percent of 80 is 10?

n • 80 = 10

n • 80 = 10 80n = 10 80 80 n = 0.125 = 12.5% REMEMBER

to change into a

percent!

Equation MethodEquation MethodWhen do you have to change a

decimal into a percent???◦When you are finding a percent

When do you need to change a percent into a decimal?◦EVERYTIME you have a percent in an

equation you MUST change it into a decimal!

Equation MethodEquation Method18 is what percent of 6?

Equation MethodEquation Method4 is what percent of 5?

Equation MethodEquation Method9 is 30% of what number?

Equation MethodEquation MethodWhat is 155% of 50?