Monday, January 17, 2011

Percent - is a number out of 100
- can also be represented as a decimal or a fraction

4.2 Representing Percents

You can represent a percent by shading squares on a hundred grid. A grid that is fully shaded means 100%. Use 2 or more hundred grids to show a percent larger than 100%. If you are shading less than 1%, shade a part of one square to represent it.

4.2 Fractions, Decimals, and Percents

Percent can also be written as a fraction and decimal. To change a percent into decimal, divide the percent by 100 to get the decimal. For changing into fraction, it is easier to use a decimal because it depends on how many digits there are after the decimal.

Example : 0.157 = 157/1000.

4.3 Percent of a Number

Doubling , halving, and dividing by ten are some strategies to find the percent of a number. Another way is converting the percent into a decimal then multiply it by the number.

Example : 12½ of 50 = 0.125
0.125 x 50 = 6.25

4.4 Combining Percents

Adding percents can solve problems, Example : 5% + 7% = 12%. To calculate the increase in a number, you can either:
-Add the percent amount to the original number.
Example : 12% of 100 = 0.12x100=12, 100 + 12 = 112
-Multiply the original number by a single percent greater than 100.
Example : 112% of 100 = 1.12 x 100

1 comment:

  1. I like how you used different coloring for different categories. The things that you can improve on is how you can make your youtube video clickable and viewable here, it would make everything a lot easier. Also you should try to use bolded or italicized words to help you out to pin point the important parts of what you are trying to learn. Other than that, great job Richard !