Percent Proportions Study Guide

Front

What is a percent?

Back

A percent is a ratio expressed as a fraction of 100. It represents a part of a whole.

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 30% of 200, calculate 200 x 0.30 = 60.

Front

What is the formula to find the percent of a part compared to a whole?

Back

The formula is: (Part/Whole) x 100 = Percent.

Front

If Sarah earns $20 a day and spends 30% of it, how much does she spend?

Back

$6

Front

What percent of $90 is $9?

Back

10%

Front

Joey gives away 3 out of 20 coins. What percent does he give away?

Back

15%

Front

If 2 red pens are 25% of the total pens, how many pens are there?

Back

8 pens

Front

How do you calculate a tip based on a percentage?

Back

To calculate a tip, multiply the total bill by the tip percentage (in decimal form). For example, for a $28 meal with a 20% tip: 28 x 0.20 = $5.60.

Front

What is the relationship between fractions and percentages?

Back

Fractions can be converted to percentages by multiplying by 100. For example, 1/4 = 0.25 = 25%.

Front

How do you convert a percentage to a decimal?

Back

To convert a percentage to a decimal, divide by 100. For example, 25% = 0.25.