## Thursday, January 20, 2011

### Final Percent Post (late)

Percent : it means out of 100 and it can also represent as a fraction or a decimal.

4.1 Representing Percents:

• To show a fractional percent between 0% and 1%, shade part of one square.
• One completely shaded grid represents 100%
• Means showing a percent as a picture in a hundred grids.

4.2 Fractions, Decimals, and Percents:

- Can be used to show numbers in different situations.

- Percents can be written as fractions and as decimals.

4.3 Percent of a number:

• · To calculate the percent of a number, write the percent as a decimal and then multiply by the number.
• · We can use mental math techniques such as halving, doubling, and dividing by 10 to find the percents of some numbers.

Example: 12 1/2 % of 50 = 0.275 x 50

= 13.75

Percent Video Questions:

4.4 Combining Percents:

· Percents can be put together by adding to solve problems.

Example: 5% + 7% = 12% ( We always use 12% as tax in our case)

· You can multiply the original number by a single percent greater than 100.

Example: 155% of 100 = 1.15 x 100

· You can add the combined percent amount to the original number.

Example: 15 % of 100 = 0.15 x 100 = 15