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 12% of 50, calculate 50 * 0.12 = 6.

Front

What is the formula to find the total when given a part and its percentage?

Back

Total = Part / (Percentage in decimal form). For example, if 20% of a total is 30, then Total = 30 / 0.20 = 150.

Front

If 25% of a number is 50, what is the number?

Back

The number is 200. (50 / 0.25 = 200)

Front

What does it mean if 60% of students passed a test?

Back

It means that out of all the students who took the test, 60 out of every 100 students passed.

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. For example, 1/4 = (1 ÷ 4) * 100 = 25%.

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.

Front

If 8 out of 10 people buy lunch, what percentage do not buy lunch?

Back

20% do not buy lunch.

Front

How do you find what percent one number is of another?

Back

To find what percent one number is of another, use the formula: (Part / Whole) * 100.