Percent Proportion.

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Presentation transcript:

Percent Proportion

Percent Means ‘of a hundred’

The Percent Proportion(s) You will use a proportion to solve most percent problems. Remember: the percent will always be related to a hundred.

The Percent Proportion(s) ‘of’ is the number with the word ‘of’ ‘is’ is the number with the word ‘is’ is % The percent % is always over 100. 100 is always on the bottom. = of 100 This proportion can be used when dealing with simple percent statements such as: “What is 10% of 100?” “10 is what percent of 100?” “10 is 10% of what number?”

Cross multiply to get the answer. 50 is what percent of 230? is of % 100 = Use the proportion. 50 x = 21.73913043 or x = 21.7% 50 is 21.7% of 230 230 100 Cross multiply to get the answer.

Cross multiply to get the answer. What is 85% of 40? is of % 100 = Use the proportion. x 85 = 40 100 x = 34 34 is 85% of 40 Cross multiply to get the answer.

Cross multiply to get the answer. 25% of what number is 400? is of % 100 = Use the proportion. 400 25 = x 100 x = 1600 25% of 1600 is 400 Cross multiply to get the answer.

Cross multiply to get the answer. What is 175% of 80? is of % 100 = Use the proportion. x 175 = 80 100 Cross multiply to get the answer. x = 140 140 is 175% of 80

19 is 25% of what number? What percent of 256 is 64? What is 45% of 178?

Cross multiply to get the answer. 19 is 25% of what number? is of % 100 = Use the proportion. 19 25 = x 100 Cross multiply to get the answer. x = 76 19 is 25% of 76

Cross multiply to get the answer. What percent of 256 is 64? is of % 100 = Use the proportion. 64 x = 256 100 Cross multiply to get the answer. x = 25% 25% of 256 is 64

Cross multiply to get the answer. What is 45% of 178? is of % 100 = Use the proportion. x 45 = 178 100 Cross multiply to get the answer. x = 80.1 80.1 is 45% of 178

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