Percents and percent problems

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 for percent increase?

Back

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

Front

If 65% of 520 students ride the bus, how many students ride the bus?

Back

338 students.

Front

What is the formula for finding the original price after a discount?

Back

Original Price = Sale Price / (1 - Discount Rate).

Front

If a shirt costs $25 and is on sale for 10% off, what is the sale price?

Back

Sale Price = $25 - ($25 x 0.10) = $22.50.

Front

What is the formula for finding the final price after multiple discounts?

Back

Final Price = Original Price x (1 - First Discount Rate) x (1 - Second Discount Rate).

Front

If Cary spent 85% of $20, how much money does she have left?

Back

Cary has $3 left.

Front

What is 30% of 60 students?

Back

18 students.

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 multiply by 100.