## Sunday, January 16, 2011

### Trish's Final Percent Post

Percent means out of 100. It is also another name for hundredths and can also be written as a fraction or decimal.

Example : 90 % = 0.9= 90/100

Representing Percents

- You can represent percent by shading squares on a hundred grid.
-To represent a percent greater than 100 % shade in 2 hundred grids.
-To represent a fractional percent between 0% and 1 % shade in a part of the square.
-To represent a fractional percent greater than 1 % you have to shade squares from the grid to show the whole number, then shade a part of a square from the grid to show the fraction.

( Just click the image above to see it, Sorry, I didn't know that it will be this small )
Fractions, Decimals and Percents

Percents can be represented as Fractions or Decimals

Example : 50 % = 0.50 = 50 /100

Percent of a Number

- You can use Mental Math Strategies such as Halving, Doubling, and Dividing by 10 to find the percent of some numbers.

To calculate the percent of a number, write the percent as a decimal then multiply by the number.

Example :
50 % of 150 =

0.50 x 150 = 75

Combining Percents

- Adding percents can be solve problems, Example : 3 % + 7 % = 10 %

- To calculate the increase in a number, add the combined percents to the original number.
Example :

15 % of 60 =
0.15 x 60 = 9
60 +9 = 69

- Or multiply the original number by a single percent greater than 100 %
Example :

15 % of 60
1.15 x 60 = 69

Percents of percents can be used to determine amounts that result from consecutive percent increases or decreases.

Percent Review Video :

During this unit, I did this post about PERCENT =

http://%20http//spmath81710.blogspot.com/2010/12/trishs-percent-scribe-post.html

http://www.mathgoodies.com/lessons/vol4/meaning_percent.html

http://www.gamequarium.com/percent.html

More VIDEOS!