Percents

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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

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

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

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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%

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Convert the decimal to a percent:
• 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”

Example #1
• 15% of 650 is what number?
Example #2
• What is 12% of 250?
Example #3
• 15% of 650 is what number?
Example #4
• What is 12% of 250?
Percentage Problems
• 15 is what percent of 50?
• 16 is 22% of what number?

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Percentage Problems
• 91 is what percent of 364?
• What is 9.5% of 75,000?

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