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Percent notation is used extensively in our everyday lives. Here are some examples: 63% of the aluminum used in the United States is recycled. 0.08% blood alcohol level is a standard used by most states at the legal limit for drunk driving. 33% of all U.S. citizens say the day they dread most is the day they go to the dentist. Section 7.11

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Percent notation is often represented in pie charts to show how the parts of a quantity are related. To draw the pie chart think of a pie cut into 100 equally sized pieces. Then shade a wedge equal in size to 56 of the pieces to represent 56%. Shade in a wedge equal to 14 of the pieces to represent 14%, and so on. Section 7.12

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3 Percent Notation The notation n% means “n per hundred.” Do you see the shortcut for going from % to decimal?????

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Section 7.14 Decimals to Percents Write percent notation for 0.6 Write percent notation for 2.35 Do you see the shortcut for going from decimal to %????? Homework: Problems 15, 27 – copy the %, then give the answer. Explain (in words) how you got the answer. Problems 55, 57 - copy the number from the problem, give the answers in sentences. Problem 61 – make a list of the categories along with the %, then find the decimal (no work needs to be shown).

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04/14/10 Percent Calculations #28

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