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 the percent of a number?

Back

To calculate the percent of a number, divide the part by the whole and multiply by 100. Formula: (Part/Whole) x 100.

Front

What is the formula for percent increase?

Back

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

Front

If 20 is 40% of a number, how do you find that number?

Back

To find the number, divide the part (20) by the percent (0.40). Formula: Number = Part / Percent.

Front

What percent of 50 is 20?

Back

40%.

Front

How do you find the percent of seats that are empty in a theater?

Back

Percent of empty seats = (Empty Seats / Total Seats) x 100.

Front

If a theater has 250 seats and 225 are sold, how many are empty?

Back

25 seats are empty.

Front

What is the percent of empty seats if 25 out of 250 seats are empty?

Back

10%.

Front

What is percent error?

Back

Percent error measures the accuracy of a measurement compared to the true value. Formula: Percent Error = (|Estimated Value - Actual Value| / Actual Value) x 100.

Front

If an archaeologist estimated a fossil to be 520 years old, but it was actually 500 years old, what is the percent error?

Back

4%.