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**Percent (Concepts & Computation)**

Dec. 2

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**Introducing Percent Percent is a ratio of a number to 100.**

The symbol for percent is % Percent means “per hundred” 17 So, is 17% 100

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**Finding Percents and Decimals**

27 Ratio; 100 Percent; 27% Decimal; 0.27

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To write a percent as a decimal, move the decimal point two places to the left. Drop the percent sign. 51% = 51. = 0.51 2% = 02. = 0.02 15.6% = 15.6 =0.156

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To write a decimal as a percent, move the decimal point two places to the right, write the percent sign. 0.82 = 0.82 = 82% 0.03 = 0.03 = 3% 0.319 = = 31.9%

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**Exercise Write each percent as a decimal**

63% = 63. = ___ 6% = 06. = ___ 22.3% = = ___ Write each decimal as a percent 0.66 = 0.66 = ___ = 0.02 = ___ 0.163 = = ____

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**Percents and Fractions**

To find the percent for any fraction, you can divide the numerator by the denominator to find the decimal. Then you can write the percent Find the percent for ½ Divide 1 by 2 = 0.5 0.5 = 50%

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Exercise Write as fraction, whole numbers, or mixed numbers. Show the answers in lowest terms. 1% 70% 400% 150% 57% 89% 175% Write as percents.

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**Finding Percent using Mental Math**

fraction think example 200% 2/1 Multiply by 2 200% of 10 100% 1/1 Multiply by 1 100% of 3 50% Multiply by ½ or divide by 2 50% of 8 25% Multiply by ¼ or divide by 4 25% of 16 10% 1/10 Multiply by 1/10 or divide by 10 10% of 460

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**Exercise 200% of 60 25% of 12 50% of 28 10% of 30 100% of 15 25% of 32**

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