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 20% of 50, calculate 50 x 0.20 = 10.

Front

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

Back

The formula is: Total = Part / (Percentage in decimal form). For example, if 20 is 20% of a total, then Total = 20 / 0.20 = 100.

Front

What is 18 percent of 36?

Back

6.48

Front

If an item costs $80 and the tax is 10%, how much is the total cost after tax?

Back

$88

Front

If 22% of 150 students do not like Dr. Pepper, how many students like it?

Back

117 students like Dr. Pepper.

Front

What is 20% of 30?

Back

6

Front

If 60 students like Takis and that represents 20% of the surveyed group, how many students were surveyed?

Back

300 students were surveyed.

Front

What does it mean if a number is increased by a percentage?

Back

It means you add that percentage of the number to the original number. For example, increasing 50 by 20% means adding 10 (20% of 50) to 50, resulting in 60.

Front

What is the relationship between fractions and percentages?

Back

Fractions can be converted to percentages by multiplying by 100. For example, 1/4 = 0.25 = 25%.