## Monday, January 17, 2011

### Final Percent Post

Percent
-means out of 100
-another name for hundredths

-65% means out of 100 or 65/100 or 0.65
-a percent that includes a portion of a percent, such as 1/2% , 0.42%, 7 3/8%, 125 3/4%, 4.5%

4.1: Representing Percents

-To represent a percent,you can shade squares on a grid of 100 squares called a hundred grid. One completely shaded grid represents 100%.

-To represent a percent greater than 100%, shade more than one grid.

-To represent a fractional percent between 0% and 1%,shade part of one square.

-To represent a fractional percent greater than 1%, shade squares from a hundred grid to show the whole number and part of one square from the grid to show the fraction.

4.2: Fractions,Decimals and Percents

-Fractions, decimals and percents can be used to represent numbers in various situations.

-Percents can be written as fractions and decimals.
1/2% = 0.5% 42 3/4% = 42.75%

4.3: Percent of a Number

-You can use mental math strategies such as halving, doubling, and dividing by ten to find the percents of some numbers.

-To calculate the percent of a number, write the percent as a decimal and then multiply the number.
12 1/2% of 50= 0.125 x 50

4.4: Combining Percents

-Percents can be combined by adding to solve problems.
5%+7% = 12%

-To calculate the increase in a number,

-You can add the combined percent amount to the original number
12% of 100= 0.12 x 100 =12
100+12= 112

-You can multiply the original number by a single percent greater than 100
112% of 100= 1.12 x 100
= 112