Percentages and Unit Rates Review

Front

What is a percentage?

Back

A percentage is a way of expressing a number as a fraction of 100. It represents how much of something there is out of a total of 100.

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 a unit rate?

Back

A unit rate is a comparison of two different quantities when they are combined together. It is often expressed as a quantity per one unit, such as miles per hour or cost per item.

Front

How do you find the unit rate from a total cost and quantity?

Back

To find the unit rate, divide the total cost by the quantity. For example, if 5 apples cost $10, the unit rate is $10 ÷ 5 = $2 per apple.

Front

What is the formula to calculate the total cost from unit price and quantity?

Back

Total Cost = Unit Price x Quantity. For example, if apples cost $1.50 per pound and you buy 9.5 pounds, Total Cost = $1.50 x 9.5 = $14.25.

Front

How do you calculate the savings percentage?

Back

Savings Percentage = (Savings Amount ÷ Original Price) x 100. For example, if a tool set costs $80 and is on sale for $68, Savings Amount = $80 - $68 = $12, so Savings Percentage = ($12 ÷ $80) x 100 = 15%.

Front

What is 50% of 28?

Back

14

Front

What is 23% of 65?

Back

14.95

Front

What is 75% of 44?

Back

33

Front

How do you convert a percentage to a decimal?

Back

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