Percents

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Percents

  1. 1. Percents Wednesday, January 27, 2010
  2. 2. Vocabulary <ul><li>Percent- a ratio of a number to 100 </li></ul><ul><li>*I want you to think of this…what does the word “cent” make you think of? </li></ul><ul><li>*My guess is pennies. How many pennies does it take to make $1? </li></ul><ul><li>*100…so any time you hear percent, I want you to remember that “per” means divide and “cent” means 100. </li></ul>
  3. 3. Writing Percents as Fractions <ul><li>ALWAYS, ALWAYS, ALWAYS write percents over 100…then you can simplify! </li></ul><ul><li>40% = 40/100 = 2/5 </li></ul>
  4. 4. Writing Percents as Decimals <ul><li>ALWAYS start by writing your percent over 100….then divide! </li></ul><ul><li>24% = 24/100 (don’t forget…BOTTOM’S out) </li></ul><ul><li>24 divided by 100 is 0.24, so… </li></ul><ul><li>24% = 0.24 </li></ul>
  5. 5. Decimals Short-Cut <ul><li>While it is mathematically correct to write the percent as a fraction and then divide, my suggestion to you is this… </li></ul><ul><li>*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. </li></ul>

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