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Published byKathryn Stephens Modified over 9 years ago

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Percent Problems Solving Simple Percent Problems

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Using the Percent Proportion Simple percent problems have three parts. 1.The percentage – easy to spot – has % 2.The base – always follows the word “of” 3.The amount – the third number

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Find 5% of 20 Identify the three parts. 1.The percentage – 5% 2.The base – of 20 3.The amount – what we are trying to find – x

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The Percent Proportion This proportion always works with simple percent problems.

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Find 5% of 20 1.The percentage – 5% 2.The base – of 20 3.The amount – what we are trying to find – x

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Find 5% of 20 Cross-multiply: 100 x = 100 Divide: x = 1 5% of 20 is 1

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What percent of 40 is 15? 1.The percentage – what we are trying to find – x 2.The base – of 40 3.The amount – 15

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What percent of 40 is 15? Cross-multiply: 40 x = 1500 Divide: x = 37.5 15 is 37.5% of 40

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20 is 40% of what number? 1.The percentage – 40% 2.The base – what we are trying to find - of what - x 3.The amount – 20

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20 is 40% of what number? Cross-multiply: 40 x = 2000 Divide: x = 50 20 is 40% of 50

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Using the Percent Proportion The percentage – easy to spot – has % The base – always follows the word “of” The amount – the third number To solve: Cross-multiply and divide

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