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# Percents

## on Feb 01, 2010

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## PercentsPresentation 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.