## Sunday, January 16, 2011

### Final Percent Post

Percent means out of 100. Which is another name for hundredths. There are also Fractional Percents. they are percents that include a portion of a percent.
Example: 0.42%.

Representing Percent:
You can represent percent by drawing a picture or using a hundred grid.
Example: To represent 180% you would need two one-hundred grids. You would shade in the first one-hundred grid and shad 80 squares on the other one.

Fractions, Decimals and Percents:
Fractions, decimals and percents can be used to represent numbers in a lot of different situations. Percents can be written as fractions and decimals.
Example: 0.5% = 1/2%.

Percent of a number:
You can use mental math strategies such as halving, dividing and doubling ten to find the percent of some numbers. You can also calculate the percent of a number by writing the percent as a decimal and then multiply it by the number.
Example: 12 1/2% of 50 = 0.125 x 50
||||||||||||||||||||||||||||| = 6.25

Combining Percents:
Percents can be combined by adding to solve problems. 5% + 7% = 12%
When you want to calculate an increase in a number, you can add the combined percent amount to the original number.
Example: 12% of 100 = 0.12 x 100 = 12.
|||||||||||100 + 12 = 112
You can multiply the original number by a single percent greater than 100.
Example: 112% of 100 = 1.12 x 100
|||||||||||||||||||||||||||= 112

Here is a good website to explain percents.