Percents Review 7th grade

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What is a percent?

Back

A percent is a ratio expressed as a fraction of 100. It represents a part of a whole.

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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.

Tags

CCSS.6.RP.A.3C

Front

What is the formula for calculating simple interest?

Back

The formula for calculating simple interest is I = PRT, where I is the interest, P is the principal amount, R is the rate (as a decimal), and T is the time in years.

Tags

CCSS.7.RP.A.3

Front

If a store marks up an item by 25%, how do you find the new price?

Back

To find the new price after a 25% markup, multiply the original price by 1.25. For example, if the original price is $40, the new price is $40 x 1.25 = $50.

Tags

CCSS.6.RP.A.3C

Front

What is the total earnings if a person earns a salary and a commission?

Back

Total earnings = Salary + Commission. For example, if the salary is $420 and the commission on $1400 sales at 7.5% is $105, then total earnings = $420 + $105 = $525.

Tags

CCSS.7.RP.A.3

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, 75% as a decimal is 75 ÷ 100 = 0.75.

Front

What does it mean to mark up a price?

Back

Marking up a price means increasing the original price of an item to cover costs and make a profit. The markup is usually expressed as a percentage of the original price.

Tags

CCSS.6.RP.A.3C

Front

How do you find the cost after a markup?

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To find the cost after a markup, multiply the original cost by (1 + markup percentage in decimal form). For example, if the original cost is $6 and the markup is 35%, the new cost is $6 x 1.35 = $8.10.

Tags

CCSS.6.RP.A.3C

Front

What is the interest earned on a loan of $1200 at 7.5% for 2 years?

Back

Using the simple interest formula I = PRT, the interest earned is I = 1200 x 0.075 x 2 = $180.

Tags

CCSS.7.RP.A.3

Front

How do you calculate the commission earned on sales?

Back

To calculate the commission earned, multiply the total sales by the commission rate (in decimal form). For example, for $1400 in sales at 7.5%, commission = $1400 x 0.075 = $105.

Tags

CCSS.7.RP.A.3