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Percent Proportion

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). ‘is’ is the number with the word ‘is’. is. %.

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Percent Proportion

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  1. Percent Proportion

  2. Percent • Means ‘of a hundred’

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

  4. = The Percent Proportion(s) ‘is’ is the number with the word ‘is’ is % The percent % is always over 100. of 100 ‘of’ is the number with the word ‘of’ 100 is always on the bottom. 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?”

  5. = = is % of 100 50 is what percent of 230? • 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.

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

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

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

  9. 19 is 25% of what number? • What percent of 256 is 64? • What is 45% of 178?

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

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

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

  13. You can also do a literal translation of the question: What percent of 256 is 64? We don’t know “WHAT PERCENT” is so we put an X “OF” means multiply. 256 is already in ‘math’ form. “IS” means equals. And 64 is already in ‘math’ form. So we have: X * 256 = 64 and solve as normal

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