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Percents by Mrs. Fredericks

Percents by Mrs. Fredericks. Use the percent proportion = Use the percent equation p art = percent • whole. Using the percent proportion = . Find the percent What percent of 15 is 9 ? Let n represent the percent = 9 • 100 = 15n 900 = 15n 15 15

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Percents by Mrs. Fredericks

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  1. Percentsby Mrs. Fredericks Use the percent proportion = Use the percent equation part = percent • whole

  2. Using the percent proportion =

  3. Find the percent What percent of 15is 9? Let n represent the percent = 9 • 100 = 15n 900 = 15n 15 15 n = 60 so it is 60%

  4. Find the part What numberis 40% of 120? Let p represent the part = 40 • 120 = 100p 4800 = 100p 100 100 p = 48

  5. Find the whole 18 is 25% of what number? Let w represent the whole = 18 • 100 = 25 w 1800 = 25 w 25 25 w = 72

  6. Using the percent equation part = percent• whole

  7. Find the percent 21 is whatpercent of 40? Let n represent the percent 21 = n• 40 21 = 40n 40 40 n = 0.525 YOU MUST CHANGE THE DECIMIAL TO % FORM So we must rewrite it as 52.5%

  8. Find the part What number is 12% of 150? Let p represent the part YOU MUST USE THE DECIMAL FORM OF THE % p = 0.12• 150 p = 18

  9. Find the whole 13 is 26% of what number? Let w represent the whole YOU MUST USE THE DECIMAL FORM OF THE % 13 = 0.26• w 13 = 0.26w 0.26 0.26 w = 50

  10. Try this problem, use either method. 3 is 12% of what number?

  11. Proportion Equation = part = percent • whole = 3 = 0.12 • w 12w = 300 3 = 0.12w 12 12 0.12 0.12 w = 25 w = 25

  12. Let’s try one more. Use the other method this time. What is 72% of 50?

  13. Proportion Equation = part = percent • whole = p = 0.72 • 50 100p = 3600 p = 36 100 100 p = 36

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