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# Percents - PowerPoint PPT Presentation

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

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

• 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

• 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

• 0.17

• 17%

• 5%

• 23%

• 236%

• 8%

• 0.05

• 0.23

• 2.36

• 0.08

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• 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%

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• 8%

• .08 =

• 3.26 =

• .75 =

• 326%

• 75%

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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”

• 15% of 650 is what number?

• What is 12% of 250?

Calculating Percents: The Proportion Method

How much is 11% of \$400?

Example #3

• 15% of 650 is what number?

Example #4

• What is 12% of 250?

• 15 is what percent of 50?

• 16 is 22% of what number?

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• 91 is what percent of 364?

• What is 9.5% of 75,000?

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• 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

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