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Solve each proportion. 1.2. 3.4. c6c6 12 15 = 21 12 7y7y = 3 + x 7 4848 = 2 + x x – 4 25 35 = 4.8 4 1212 –17 Math on the Mind

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Percents Unit 4, Lesson 11 Mrs. King Picture from hoffnermath.wordpress.com

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Let’s refresh our memory: http://www.brainpop.com/math/ratioproportio nandpercent/percents/preview.wemlhttp://www.brainpop.com/math/ratioproportio nandpercent/percents/preview.weml

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What does percent mean? “per” means out of “cent” means 100 ▫How many years in a “century”? ▫How many “cents” in a dollar? ▫How many legs on a “centipede”?

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Converting Percents to Decimals 2To change a percent to a decimal, drop the % sign and move the decimal point 2 places to the left www.thericeschool.org

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Convert each percent to a decimal: ▫17% ▫5% ▫23% ▫236% ▫8% www.thericeschool.org 0.17 0.05 0.23 2.36 0.08

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Converting Decimals to Percents 2To change a decimal to a percent, move the decimal point 2 places to the right and attach a % sign. www.thericeschool.org

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Convert the decimal to a percent: ▫.08 = ▫3.26 = ▫.75 = www.thericeschool.org 8% 326% 75%

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Change to a Decimal Change to a Decimal Calculating Percents: The Equation Method How much is 11% of $400? The unknown! The unknown! The unknown! “Equals” “Equals” “Equals” Change to a decimal Change to a decimal “Multiply” “Multiply” “Multiply” $400 $400 $400

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Example #1 15% of 650 is what number?

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Example #2 What is 12% of 250?

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Proportions to remember!

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Calculating Percents: The Proportion Method How much is 11% of $400?

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Example #3 15% of 650 is what number?

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Example #4 What is 12% of 250?

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Percentage Problems 15 is what percent of 50? 16 is 22% of what number? www.thericeschool.org

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Percentage Problems 91 is what percent of 364? What is 9.5% of 75,000? www.thericeschool.org

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Try these on your own: 42 is what percent of 112? What percent of 38 is 19? What is 0.5% of 2350? http://www.quia.com/mc/499 417.htmlhttp://www.quia.com/mc/499 417.html

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