Unit Rates & Proportions

Front

What is a unit rate?

Back

A unit rate is a comparison of two different quantities when they are combined together. It expresses how many units of one quantity correspond to one unit of another quantity.

Front

How do you calculate a unit rate?

Back

To calculate a unit rate, divide the total quantity of one item by the total quantity of another item. For example, if a car travels 440 miles in 8 hours, the unit rate is 440 miles ÷ 8 hours = 55 miles per hour.

Front

What is a proportion?

Back

A proportion is an equation that states that two ratios are equal. For example, if a/b = c/d, then a, b, c, and d are in proportion.

Front

How do you solve a proportion?

Back

To solve a proportion, cross-multiply the terms and set the products equal to each other. For example, if a/b = c/d, then ad = bc.

Front

If Izzy drinks 8 glasses of water a day, how many glasses will she drink in 2 weeks?

Back

Izzy will drink 8 glasses/day × 14 days = 112 glasses in 2 weeks.

Front

What is the better buy: a 12 pack of Coke for $3.50 or a 6 pack for $1.80?

Back

The better buy is the 12 pack of Coke, which costs about $0.29 per can compared to $0.30 per can for the 6 pack.

Front

How do you determine the better value between two products?

Back

To determine the better value, calculate the unit price for each product (price per unit) and compare them. The lower unit price indicates the better value.

Front

What is the unit price of Kraft cheese if it costs $2.29 per oz?

Back

The unit price of Kraft cheese is $2.29 per oz.

Front

What is the unit price of Simple cheese if it costs $1.88 per oz?

Back

The unit price of Simple cheese is $1.88 per oz.

Front

If Kraft cheese costs $0.44 per oz, how does it compare to Simple cheese at $0.53 per oz?

Back

Kraft cheese is a better value because it costs less per ounce than Simple cheese.