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Percents

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Percents

Unit 4, Day 8

Mrs. King

Picture from hoffnermath.wordpress.com

- “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”?

- 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

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- 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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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?

How much is 11% of $400?

- 15% of 650 is what number?

- 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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