## Sunday, January 16, 2011

### Final Percent Post

Percent means out of 100 and is another name for hundreths.
ex. 75% means 75 out of 100 or 75/100 or 0.65.

4.1 Representing Percents

-This section talks about how to represent percents in different ways like representing them on a hundred grid.
ex. to represent 50% on a hundred grid, you would shade in 50 units.

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.
ex. 15% = 15/100
= 0.15

4.3 Percent of a Number

-You can use mental math strategies such as halving, doubling, and dividing be 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.
ex. 25% of 50 = 0.25 x 50
= 12.5

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

- To calculate the increase of a number,

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

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

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

Here's a link to my scribe post for this chapter.