Percentage problems

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 (in decimal form). For example, to find 30% of 80, calculate 80 * 0.30 = 24.

Front

What does it mean to find 'X percent of Y'?

Back

Finding 'X percent of Y' means calculating how much X percent represents in terms of Y. It is done by multiplying Y by X/100.

Front

What is 75% of 40?

Back

30

Front

What is 30% of 80?

Back

24

Front

What is 80% of 40?

Back

32

Front

If 3 out of 25 men are left-handed, what percent are left-handed?

Back

12% (calculated as (3/25) * 100).

Front

What is 20 as a percentage of 30?

Back

67% (calculated as (20/30) * 100).

Front

How do you convert a fraction to a percentage?

Back

To convert a fraction to a percentage, divide the numerator by the denominator and then multiply by 100.

Front

What is the formula for calculating percentage change?

Back

Percentage change = ((New Value - Old Value) / Old Value) * 100.