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Percents
 

Percents

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    Percents Percents Presentation Transcript

    • Percents Wednesday, January 27, 2010
    • Vocabulary
      • Percent- a ratio of a number to 100
      • *I want you to think of this…what does the word “cent” make you think of?
      • *My guess is pennies. How many pennies does it take to make $1?
      • *100…so any time you hear percent, I want you to remember that “per” means divide and “cent” means 100.
    • Writing Percents as Fractions
      • ALWAYS, ALWAYS, ALWAYS write percents over 100…then you can simplify!
      • 40% = 40/100 = 2/5
    • Writing Percents as Decimals
      • ALWAYS start by writing your percent over 100….then divide!
      • 24% = 24/100 (don’t forget…BOTTOM’S out)
      • 24 divided by 100 is 0.24, so…
      • 24% = 0.24
    • Decimals Short-Cut
      • While it is mathematically correct to write the percent as a fraction and then divide, my suggestion to you is this…
      • *When you write the percent over 100, you are going to be dividing by 100. Rather than go through all the work, simply move the decimal 2 places to the left to get your percent written as a decimal.