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,

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

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

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


Click here to go to another scribe that I made on percents.

Click here to go to a site that explains more about percentage.

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