Percentages

Front

What is a percentage?

Back

A percentage is a way of expressing a number as a fraction of 100. It is often used to compare proportions.

Front

How do you calculate a percentage of a number?

Back

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

Front

What is 50% of a number?

Back

50% of a number is half of that number. For example, 50% of 80 is 40.

Front

What is the formula to find the percentage increase?

Back

Percentage Increase = ((New Value - Old Value) / Old Value) x 100.

Front

What is the formula to find the percentage decrease?

Back

Percentage Decrease = ((Old Value - New Value) / Old Value) x 100.

Front

Convert 25% to a fraction.

Back

25% as a fraction is 1/4.

Front

Convert 10% to a decimal.

Back

10% as a decimal is 0.10.

Front

If a shirt costs $40 and is on sale for 25% off, what is the sale price?

Back

The sale price is $30. (25% of $40 is $10, so $40 - $10 = $30.)

Front

What is 75% of 200?

Back

75% of 200 is 150. (200 x 0.75 = 150.)

Front

If you scored 45 out of 60 on a test, what is your score as a percentage?

Back

Your score is 75%. (45/60 = 0.75, and 0.75 x 100 = 75.)