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Finding a Percent of a Number

Finding a Percent of a Number. Lesson 6-7. Using a Proportion. Set up a proportion that uses the percent over 100. Cross multiply to write an equation. Solve the equation. To set up your proportion, think, “IS over OF equals PERCENT over 100.”. Example – What is 20% of 30?. x. 20. part.

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Finding a Percent of a Number

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  1. Finding a Percent of a Number Lesson 6-7

  2. Using a Proportion • Set up a proportion that uses the percent over 100. • Cross multiply to write an equation. • Solve the equation. To set up your proportion, think, “IS over OF equals PERCENT over 100.”

  3. Example – What is 20% of 30? x 20 part = 30 100 whole 100x = 30(20) 100x = 600 100 100 x 6 =

  4. Using a Decimal • Change the percent to a decimal. • Multiply that decimal by the number you are finding the percent of.

  5. Example – What is 18% of 70? 18% = 0.18 0.18 x 70 = 12.6

  6. Homework Time

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