Percent Proportion and Percent Change

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 the percent of a number?

Back

To calculate the percent of a number, multiply the number by the percent (in decimal form) and then divide by 100.

Front

What is the formula for percent proportion?

Back

The formula for percent proportion is: (part/whole) = (percent/100).

Front

If 18 out of 25 questions are correct, what percent is that?

Back

72%.

Front

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

Back

To find the total amount, divide the part by the percent (in decimal form).

Front

What is percent change?

Back

Percent change is a measure of how much a quantity has increased or decreased relative to its original value.

Front

How do you calculate percent change?

Back

Percent change = ((new value - old value) / old value) x 100.

Front

If Sarah earns $20 and spends 30% of it, how much does she spend?

Back

$6.

Front

What percent of 60 books are nonfiction if 24 are nonfiction?

Back

40%.

Front

If a car race has 30 cars and 12 finish, what percent finished?

Back

40%.