Percent Proportions

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 18% of 20, calculate 20 * 0.18 = 3.6.

Front

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

Back

The formula is: (part/whole) * 100. For example, to find what percent 15 is of 125, calculate (15/125) * 100 = 12%.

Front

If 36 out of 60 is what percent, how do you find the answer?

Back

Use the formula: (part/whole) * 100. So, (36/60) * 100 = 60%.

Front

What does it mean if a number is 72% of another number?

Back

It means that the first number is 72 parts out of 100 of the second number.

Front

How can you convert a percentage to a decimal?

Back

To convert a percentage to a decimal, divide by 100. For example, 72% becomes 0.72.

Front

What is the relationship between fractions and percentages?

Back

Fractions can be converted to percentages by multiplying by 100. For example, 1/2 = 0.5 = 50%.

Front

How do you find the whole if you know the part and the percent?

Back

Use the formula: whole = part / (percent/100). For example, if 15 is 12%, the whole is 15 / (12/100) = 125.

Front

What is the percent increase formula?

Back

Percent Increase = ((new value - original value) / original value) * 100.

Front

What is the percent decrease formula?

Back

Percent Decrease = ((original value - new value) / original value) * 100.