Unit 3 Unit Rates and Percentages Review

Front

What is a unit rate?

Back

A unit rate is a comparison of two different quantities where one of the quantities is expressed as a quantity of one. For example, if a car travels 300 miles in 5 hours, the unit rate is 60 miles per hour.

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 50% of 15, calculate 15 x 0.50 = 7.5.

Front

What is the formula to convert inches to centimeters?

Back

To convert inches to centimeters, multiply the number of inches by 2.54. For example, 7 inches x 2.54 = 17.78 cm.

Front

How do you find 30% of a total time?

Back

To find 30% of a total time, multiply the total time by 0.30. For example, for 80 minutes, calculate 80 x 0.30 = 24 minutes.

Front

How do you compare distances measured in different units?

Back

To compare distances in different units, convert them to the same unit. For example, convert feet to inches by multiplying by 12 (1 foot = 12 inches).

Front

What is the cost of buying multiple pounds of an item priced per pound?

Back

To find the total cost, multiply the price per pound by the number of pounds. For example, if apples cost $1.50 per pound, then 9.5 pounds cost 1.50 x 9.5 = $14.25.

Front

What is 25% of 200?

Back

25% of 200 is calculated as 200 x 0.25 = 50.

Front

How many centimeters are in 10 inches?

Back

10 inches is equal to 10 x 2.54 = 25.4 cm.

Front

If a student scored 80% on a test with 50 questions, how many questions did they answer correctly?

Back

To find the number of correct answers, calculate 50 x 0.80 = 40 questions.

Front

What is the relationship between fractions and percentages?

Back

A percentage is a fraction with a denominator of 100. For example, 25% is equivalent to the fraction 25/100.