Ratios and Proportions Review

Front

What is a ratio?

Back

A ratio is a comparison of two quantities by division, showing how many times one value contains or is contained within the other.

Front

How do you write a proportion?

Back

A proportion is an equation that states that two ratios are equal, often written as a/b = c/d.

Front

If the ratio of dogs to cats is 5 to 3 and there are 25 dogs, how many cats are there?

Back

c = 15

Front

What is a unit rate?

Back

A unit rate is a comparison of two different quantities when they are combined together, expressed as a quantity of one per unit of another.

Front

If 3 pounds of hamburger costs $6, what is the cost per pound?

Back

$2 per pound.

Front

If Alicia buys 10 pounds of hamburger at $2 per pound, how much will she pay?

Back

$20.

Front

How do you find the total amount of a proportional relationship?

Back

Multiply the unit rate by the total quantity.

Front

If a 12-ounce bottle of shampoo lasts 16 weeks, how long would an 18-ounce bottle last?

Back

24 weeks.

Front

What is the formula to find the missing value in a proportion?

Back

Cross-multiply and solve for the unknown.

Front

If there are 5 ice cream cones for every 3 brownies sold, how many cones are sold if 24 brownies are sold?

Back

40 ice cream cones.