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## PowerPoint Slideshow about ' Percents' - gaura

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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”?

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

www.thericeschool.org

Convert each percent to a decimal:

- 0.17

- 17%
- 5%
- 23%
- 236%
- 8%

- 0.05

- 0.23

- 2.36

- 0.08

www.thericeschool.org

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

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?

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?

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

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