Percent Proportions Review #1

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 20% of 50, calculate 50 x 0.20 = 10.

Front

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

Back

The formula is (part/whole) x 100 = percent. For example, to find what percent 30 is of 150, calculate (30/150) x 100 = 20%.

Front

What does it mean to find 'of' in a percentage problem?

Back

Finding 'of' in a percentage problem means to multiply the total amount by the percentage.

Front

If 30% of 200 is 60, how do you find 30% of another number?

Back

To find 30% of another number, multiply that number by 0.30. For example, for 300, calculate 300 x 0.30 = 90.

Front

What is the relationship between fractions and percentages?

Back

Fractions can be converted to percentages by dividing the numerator by the denominator and multiplying by 100.

Front

How do you convert a percentage to a decimal?

Back

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

Front

What is the tip calculation based on a percentage?

Back

To calculate a tip, multiply the total bill by the tip percentage (in decimal form). For example, for an $85 bill with a 20% tip, calculate 85 x 0.20 = 17.

Front

What is 12% of 75?

Back

12% of 75 is 9. (75 x 0.12 = 9)

Front

How do you find the total amount if you know the part and the percentage?

Back

Use the formula: total = part / (percentage in decimal form). For example, if 39 is 30% of a total, total = 39 / 0.30 = 130.