Percents 7th grade - Smith

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 40% of 230, calculate 230 x 0.40 = 92.

Front

What does it mean to add sales tax to a price?

Back

Adding sales tax means increasing the original price by a certain percentage to account for tax. For example, if an item costs $100 and the sales tax is 5%, the total cost is $100 + ($100 x 0.05) = $105.

Front

How do you find the sale price after a discount?

Back

To find the sale price after a discount, subtract the discount amount from the original price. For example, if a pair of boots costs $94.99 and has a 25% discount, the discount is $94.99 x 0.25 = $23.75, so the sale price is $94.99 - $23.75 = $71.24.

Front

What is the formula to calculate total cost including tax?

Back

Total Cost = Original Price + (Original Price x Sales Tax Rate). For example, if a T.V. costs $990 and the tax rate is 9%, the total cost is $990 + ($990 x 0.09) = $1,079.10.

Front

What is the meaning of 'discount'?

Back

A discount is a reduction in the price of an item, usually expressed as a percentage of the original price.

Front

If an item costs $50 and is on sale for 20% off, what is the sale price?

Back

Sale Price = Original Price - (Original Price x Discount Rate) = $50 - ($50 x 0.20) = $40.

Front

What is the relationship between fractions and percents?

Back

Percents are a specific type of fraction where the denominator is always 100. For example, 25% is equivalent to 25/100.

Front

How do you convert a percent to a decimal?

Back

To convert a percent to a decimal, divide the percent by 100. For example, 75% becomes 0.75.

Front

What is the total cost of items if the prices are $3.50, $2.25, and $9.95 with a 5% sales tax?

Back

Total Cost = (3.50 + 2.25 + 9.95) + 5% tax = $15.70 + ($15.70 x 0.05) = $16.49.