Percent %


Percent means Out of 100

A percent is a decimal, and also a fraction. e.g. 25% = 0.25 and 25/100

Also a percent is how much or how little something is to being full/empty. also it is how much is in something that has a similar characteristic. e.g. 12% of the bag of jelly beans are green jelly beans.

To change a percent into a decimal move the decimal two to the left. or divide by 100
http://www.youtube.com/watch?v=1Ly3_5YdbOA (Wont put video in, do it at home.)

To change a decimal into a percent move the decimal two to the right. or multiply by 100

To change a percent into a fraction:
Step 1: Write down the percent divided by 100.
Step 2: If the percent is not a whole number, then multiply both top and bottom by 10 for every number after the decimal point. (For example, if there is one number after the decimal, then use 10, if there are two then use 100, etc.)
Step 3: Simplify (or reduce) the fra+ction
To change a fraction into a percent:
Step 1: Divide the numerator by the Denomenator (top by the bottom)
Step 2: Multiply the result by 100

Here is a game to help you with fractions:
http://www.mathplayground.com/Decention/Decention.html


Examples to help you understand percent better:


Express as a Percent: a) 0.73 ---> 0.73x100 ---> 73 ---> add % sign ---> 73%

b) 0.25 ---> 0.25x100 ---> 25 ---> add % sign ---> 25%

c) 1/2 ---> 1 divided by 2 ---> 0.5 ---> 0.5x100 ---> 50 ---> add % sign ---> 50%

d) 7/10 ---> 7 divided by 10 ---> 0.7 ---> 0.7x100 ---> 70 ---> add % sign ---> 70%

Practice these questions on a seperate peice of paper!

Express as a Percent: a) 2/4 b) 7/10 c) 0.43 d) 0.82a
Express as a Decimal: a) 25% b) 49% c) 92%
Express as a Fraction: a) 10% b) 64% c) 85%