Finding Whole and Part from Percent

Front

What is a percent?

Back

A percent is a way to express a number as a fraction of 100. It is often used to compare ratios and express how much of something there is in relation to 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 (as a decimal). For example, to find 20% of 50, calculate 50 x 0.20 = 10.

Front

What does it mean to find the whole from a percent?

Back

Finding the whole from a percent means determining the total amount when you know a part of it and the percent that part represents.

Front

If 40% of a number is 20, what is the whole number?

Back

To find the whole number, divide the part by the percent (as a decimal). So, 20 ÷ 0.40 = 50.

Front

How do you find a part from a percent?

Back

To find a part from a percent, multiply the whole number by the percent (as a decimal). For example, to find 30% of 200, calculate 200 x 0.30 = 60.

Front

What is 90% written as a decimal?

Back

0.90

Front

What is 100% of any number?

Back

100% of any number is the number itself. For example, 100% of 23 is 23.

Front

If a shirt costs $20 and is on sale for 40% off, how much do you save?

Back

You save $8. (20 x 0.40 = 8)

Front

If there are 240 students and 80% voted for the zoo, how many voted for the zoo?

Back

192 students voted for the zoo. (240 x 0.80 = 192)

Front

What is the formula to find the discount amount?

Back

Discount Amount = Original Price x Discount Rate (as a decimal).