Percents

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 proportions.

Front

How do you calculate a percent of a number?

Back

To calculate a percent of a number, multiply the number by the percent (as a decimal). For example, to find 25% of 200, calculate 200 x 0.25 = 50.

Front

What is 50% of a number?

Back

50% of a number is half of that number. For example, 50% of 80 is 40.

Front

How do you convert a fraction to a percent?

Back

To convert a fraction to a percent, divide the top number (numerator) by the bottom number (denominator) and then multiply by 100. For example, 1/4 = 0.25 x 100 = 25%.

Front

What is 25% of 200?

Back

25% of 200 is 50.

Front

If you have 60 students and 30% are girls, how many girls are there?

Back

There are 18 girls. (60 x 0.30 = 18)

Front

What is the formula to find the percent increase?

Back

Percent increase = (New Value - Original Value) / Original Value x 100.

Front

What is the formula to find the percent decrease?

Back

Percent decrease = (Original Value - New Value) / Original Value x 100.

Front

If a shirt costs $40 and is on sale for $30, what is the percent decrease in price?

Back

The percent decrease is 25%. ((40 - 30) / 40 x 100 = 25%).

Front

What is 75% of 64?

Back

75% of 64 is 48.