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 convert a fraction to a percent?

Back

To convert a fraction to a percent, divide the numerator by the denominator and then multiply 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 discounted by 20%?

Back

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

Front

How do you find the percent increase?

Back

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

Front

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

Back

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

Front

What is a proportion?

Back

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

Front

How do you set up a proportion to solve for an unknown?

Back

Cross-multiply the known values and set them equal to each other.

Front

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

Back

18 students passed. (0.60 x 30 = 18)