## Sunday, January 16, 2011

### Final Percent Post

1. Percent means out of one hundred. It is also known as hundreths. Percents can also be represented as fractions and decimals
For example, 89% = 0.89, 89/100

Representing Percents
You can represent percents by showing it on a hundred grid.
For example,
100%

Fractions, Decimals, Percents
Percents can also be shown as decimals, and fractions.
For example,
2/4= 50% 12%=0.12

Percent of a Number
You can use mental math strategies like halving, doubling, and dividing by 10 to find a percent of a number. You can also write the percent as a decimal then multiply it by the number.
For example,
12 1/2 % of 50 = 0.125 x 50 12 1/2% = 12.5%
= 6.25 = 0.125

Combining Percents
You can combine percents to find the answer to a problem.
For example,
Find the total tax.
5% PST + 7% GST = 12% total tax

You can find the increase of a number by adding the combined percent to the original number.
For example,
10% of 100 = 0.1 x 100 = 10
100+10=110

To find the increase of a number, multiply the original number by a percent greater than 100.
For example,
110% 0f 100 = 1.1 x 100
=110

You can use percents of percents to find amounts that result from consecutive percent increase or decrease.

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