6.5B - Percent proportions

Front

What is a percent?

Back

A percent is a way of expressing a number as a fraction of 100. It is denoted by the symbol '%'.

Front

How do you calculate the percent of a number?

Back

To calculate the percent of a number, multiply the number by the percent (as a decimal). For example, to find 20% of 50, calculate 50 x 0.20 = 10.

Front

What is the formula to find the total when given a part and its percent?

Back

The formula is: Total = Part / (Percent as a decimal). For example, if 30 is 60% of a total, then Total = 30 / 0.60 = 50.

Front

If 50% of a class of 40 students are girls, how many girls are there?

Back

20 girls.

Front

What is the percent of students who do not like pizza if 30 out of 100 students do?

Back

70% do not like pizza.

Front

How do you convert a fraction to a percent?

Back

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

Front

If a painter has painted 45% of a fence and that equals 90 feet, how long is the entire fence?

Back

200 feet.

Front

What percent of 350 people is 70 people?

Back

20%.

Front

If 60% of a class of 30 students are boys, how many boys are there?

Back

18 boys.

Front

What is the percent of a shaded area if 3 out of 5 parts are shaded?

Back

60%.