Fractions, Decimals, and Percents

Writing Percents as Decimals

Remove the percent symbol. Then divide by 100, or just move the decimal point two places to the left.

Example: 23% = 23.% = 0.23

Writing Decimals as Percents

Multiply by 100, or just move the decimal point two places to the right. Then add a percent symbol.

Example: 0.36 = 0.36 = 36%

Percent and Fractions

Since percents means per 100, to write p% as a fraction, use p as the numerator and 100 as a denominator. Then simplify.

Example: Write 25% as a fractionWrite as a percent

Circle GraphsStudents in a class were asked to tell their favorite color.

a. What percent said red, blue, or yellow?b. How many times more students said red than yellow?c. Use two methods to find the percent of students who said green. Which method do you prefer?

Homework

pg 361 # 3, 9, 11, 13, 17, 21, 22, 23, 31, 35, 41, 66-69