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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

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?
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

stopforfun.wordpress.com

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