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.

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Percents

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Percents

Percents

Unit 4, Day 8

Mrs. King

Picture from hoffnermath.wordpress.com


What does percent mean

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

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

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

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

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


Convert the decimal to a percent

Convert the decimal to a percent:

  • 8%

  • .08 =

  • 3.26 =

  • .75 =

  • 326%

  • 75%

www.thericeschool.org


Calculating percents the equation method

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

Example #1

  • 15% of 650 is what number?


Example 2

Example #2

  • What is 12% of 250?


Proportions to remember

Proportions to remember!


Calculating percents the proportion method

Calculating Percents: The Proportion Method

How much is 11% of $400?


Example 3

Example #3

  • 15% of 650 is what number?


Example 4

Example #4

  • What is 12% of 250?


Percentage problems

Percentage Problems

  • 15 is what percent of 50?

  • 16 is 22% of what number?

www.thericeschool.org


Percentage problems1

Percentage Problems

  • 91 is what percent of 364?

  • What is 9.5% of 75,000?

www.thericeschool.org


Try these on your own

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


Homework

Homework

Page 167

#1-12

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