Percent Proportions

Front

What is a percent?

Back

A percent is a ratio that compares a number to 100. It is often used to express how much of something there is in relation to a whole.

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 the result by 100.

Front

What is the formula for finding a percent of a number?

Back

The formula is: Percent (%) = (Part/Whole) x 100.

Front

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

Back

The number is 200. (50 = 25% of x; x = 50 / 0.25 = 200)

Front

What does it mean if a price is marked down by 20%?

Back

It means that the price is reduced by 20 out of every 100 units of the original price.

Front

How do you find the percent increase from 50 to 75?

Back

Percent Increase = ((New Value - Old Value) / Old Value) x 100 = ((75 - 50) / 50) x 100 = 50%.

Front

What is a proportion?

Back

A proportion is an equation that states that two ratios are equal.

Front

If 60% of a class of 30 students passed a test, how many students passed?

Back

18 students passed. (60% of 30 = 0.60 x 30 = 18)

Front

What is the relationship between percent, fraction, and decimal?

Back

Percent is a fraction with a denominator of 100, and it can also be expressed as a decimal by dividing by 100.

Front

How do you calculate the percent of a total?

Back

To calculate the percent of a total, divide the part by the total and multiply by 100.