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Percents

Percents. Unit 4, Day 8 Mrs. King. Picture from hoffnermath.wordpress.com. 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”?. Decimals  Percents.

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Percents

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  1. Percents Unit 4, Day 8 Mrs. King Picture from hoffnermath.wordpress.com

  2. 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”?

  3. Decimals  Percents • A percent can always be written as a decimal, and a decimal can be written as a percent, by moving the decimal point two places to the right like this: http://www.math.com/school/subject1/lessons/S1U1L7GL.html#sm1

  4. Converting Percents to Decimals • To change a percent to a decimal, drop the % sign and move the decimal point two places to the left • Express the percents as a decimal • 30% = .30 • 125 % = 1.25 www.thericeschool.org

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

  6. Converting Decimals to Percents • To change a decimal to a percent, move the decimal point two places to the right and attach a % sign. • Ex: 0.34 = 34% • Ex: 0.01 = 1% www.thericeschool.org

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

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

  9. Example #1 • 15% of 650 is what number?

  10. Example #2 • What is 12% of 250?

  11. Proportions to remember!

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

  13. Example #3 • 15% of 650 is what number?

  14. Example #4 • What is 12% of 250?

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

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

  17. 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/499417.html

  18. Homework Page 167 #1-12 stopforfun.wordpress.com

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