## Friday, January 14, 2011

### Hanin's percent review video

Percents Review

4.1 Representing percents

Percent: means out of a hundred (another name for hundredths) 65% means 65 out of a hundred
fractional Percent: a percent that includes a portion of a percent

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 as decimals 1/2%= o.5
o.5/100

4.3 Percent of a Number

- you can use mental math strategies such as halving, doubling, and dividing by ten 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 12 1/2= 12.5% = 0.125
12 1/2% of 50 = 0.125x5o= 6.25

4.4 Combining Percents

- pecents 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 percent
_ you can multiply the original number by a single percent greater than 100

- percents of percents can be used to determine amounts that result from consecutive increases or decreases

Here's my video