## Saturday, January 15, 2011

### Shenna's Final Percent Post

Percent means out of 100. It can be written as decimals or fractions and it is another name for hundredths.
For example: 10% means 10/100 or 0.10.

4.1 Representing Percents
- Shade squares on a hundred grid to represent a percent. One fully shaded grid represents 100%
- Shade part of one square to represent a fractional percent less than 1%.
- Shade more than one  grid to represent a percent bigger than 100%
- Shade squares to represent the whole number and shade part of one square to represent the fraction.

﻿4.2 Fractions, Decimals and Percents
- Percent can be written as decimals or fractions
- In different circumstances, numbers can be represented by decimals, fractions and percents.
For example: 2/5% = 0.4%     0.4% = 0.4/100 = 0.004

4.3 Percent of a Number
- To find the percents of some numbers, you can use mental math strategies such as halving, doubling and dividing by ten.
- Write the percent as a decimal and then multiply by the number to calculate the percent of a number.
For example: 15 1/2% of 60 = 0.155 X 60 = 9.30

4.4 Combining Percents
- To solve problems, percents can be combined by adding.   5% + 6% = 11%
- To determine amounts that results from consecutive percent increases or decreases, percents of percents can be used.
- To calculate the increase in a number, you can add the combined percent amount to the original number.
For example: 20% of 100 = 0.2X100 = 20         100+20=120
Or you can multiply the original number by a single percent greater than 100.
For example: 120% of 100 = 1.2X100=120

Here's my percent video.