Basic Percents

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 to calculate the total cost after adding a tip?

Back

Total Cost = Original Cost + (Tip Percentage x Original Cost).

Front

How do you find the new price after a discount?

Back

New Price = Original Price - (Discount Percentage x Original Price).

Front

What is the formula to calculate the total cost after tax?

Back

Total Cost = Original Cost + (Tax Percentage x Original Cost).

Front

If an item costs $100 and has a 25% discount, what is the new price?

Back

New Price = $100 - ($100 x 0.25) = $75.

Front

How do you convert a percentage to a decimal?

Back

To convert a percentage to a decimal, divide the percentage by 100. For example, 25% = 25 ÷ 100 = 0.25.

Front

What does it mean to increase a number by a percentage?

Back

Increasing a number by a percentage means adding that percentage of the number to the original number. For example, increasing 200 by 10% means adding 20, resulting in 220.

Front

What does it mean to decrease a number by a percentage?

Back

Decreasing a number by a percentage means subtracting that percentage of the number from the original number. For example, decreasing 200 by 10% means subtracting 20, resulting in 180.

Front

If a shirt costs $40 and is on sale for 30% off, how much do you save?

Back

You save $40 x 0.30 = $12.