Percent Proportions Review #1

Front

What is a percent?

Back

A percent is a ratio expressed as a fraction of 100. It represents how many parts out of 100 something is.

Front

How do you calculate a percentage of a number?

Back

To calculate a percentage of a number, multiply the number by the percentage (in decimal form). For example, to find 20% of 50, calculate 50 * 0.20 = 10.

Front

What is the formula to find what percent one number is of another?

Back

The formula is (part/whole) * 100. For example, to find what percent 18 is of 20, calculate (18/20) * 100 = 90%.

Front

If 12% of the cars are blue and 75 cars went through the car wash, how many are blue?

Back

9 cars are blue. (75 * 0.12 = 9)

Front

What is 20% of 102?

Back

20.4 (0.20 * 102 = 20.4)

Front

What is 40% of 230?

Back

92 (0.40 * 230 = 92)

Front

How do you convert a fraction to a percent?

Back

To convert a fraction to a percent, divide the top number (numerator) by the bottom number (denominator) and multiply by 100. For example, 1/4 = (1 ÷ 4) * 100 = 25%.

Front

What percent grade did Shirley get if she spelled 12 out of 15 words correctly?

Back

80% (12/15 = 0.8, and 0.8 * 100 = 80%)

Front

What is the relationship between percent, fraction, and decimal?

Back

Percent is a way to express a fraction with a denominator of 100. A decimal is another way to express a fraction. For example, 25% = 25/100 = 0.25.

Front

How do you find the part when given the whole and the percent?

Back

To find the part, multiply the whole by the percent (in decimal form). For example, to find 30% of 200, calculate 200 * 0.30 = 60.