Ratio, Rates, Unit Rates, and Proportions

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

What is a rate?

Back

A rate is a specific kind of ratio that compares two different units, such as miles per hour or cost per item.

Front

What is a unit rate?

Back

A unit rate is a rate in which the denominator is 1, indicating how much of one quantity corresponds to one unit of another quantity.

Front

How do you calculate a unit rate?

Back

To calculate a unit rate, divide the numerator by the denominator to find the amount per one unit of the denominator.

Front

If Mike takes 18 minutes to read 4 pages, how long does it take him to read 1 page?

Back

4.5 minutes per page.

Front

If a recipe calls for a ratio of 2 cups of flour to 3 cups of sugar, what is the unit rate of flour to sugar?

Back

The unit rate is 2/3 cups of flour per cup of sugar.

Front

What is a proportion?

Back

A proportion is an equation that states that two ratios are equal.

Front

If there are 5 ice cream cones for every 3 brownies, what is the ratio of ice cream cones to brownies?

Back

The ratio is 5:3.

Front

How do you solve for an unknown in a proportion?

Back

Cross-multiply the known values and then solve for the unknown.

Front

What is the cost per pound if 4 pounds of bananas cost $6?

Back

$1.50 per pound.