Percent Proportions

Front

What is a percent?

Back

A percent is a way to express a number as a fraction of 100. It is often used to compare ratios.

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) and then divide by 100.

Front

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

Back

Total = Part / (Percent / 100)

Front

If 15 out of 25 boys chose to go swimming, how do you find the percent?

Back

Divide 15 by 25 and multiply by 100. (15/25) * 100 = 60%.

Front

What percent of 50 is 20?

Back

To find this, divide 20 by 50 and multiply by 100. (20/50) * 100 = 40%.

Front

If 2 red pens are 25% of the total pens, how do you find the total?

Back

Total = 2 / (25 / 100) = 8 pens.

Front

What is 5% of a number?

Back

To find 5% of a number, multiply the number by 0.05.

Front

How do you calculate a tip as a percent of a meal cost?

Back

Multiply the meal cost by the tip percent (as a decimal). For example, for a $28 meal and a 20% tip: $28 * 0.20 = $5.60.

Front

What is the relationship between fractions and percents?

Back

Percents are fractions with a denominator of 100. For example, 25% is the same as 25/100.

Front

How do you convert a percent to a decimal?

Back

To convert a percent to a decimal, divide by 100. For example, 40% = 0.40.