Unit Rates

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 much of one quantity corresponds to one unit of another quantity.

Front

How do you calculate the unit cost per item?

Back

To calculate the unit cost per item, divide the total cost by the number of items. For example, if 15 pizzas cost $97.50, the unit cost per pizza is $97.50 ÷ 15 = $6.50.

Front

What is the unit rate of a box of 35 diapers that costs $6.99?

Back

The unit rate is $6.99 ÷ 35 = $0.20 per diaper.

Front

How do you determine which is the better buy between two products?

Back

To determine the better buy, calculate the unit price for each product and compare them. The product with the lower unit price is the better buy.

Front

If a 12 ounce can of corn costs $1.92 and a 20 ounce can costs $3.00, which is the better buy?

Back

The 20 ounce can is the better buy because its unit price is lower than that of the 12 ounce can.

Front

How do you find the ratio of two quantities?

Back

To find the ratio of two quantities, divide one quantity by the other. For example, if you have 2 drops of red and 3 drops of yellow, the ratio of red to yellow is 2:3.

Front

If 36 drops of yellow are used, how many drops of red are needed if the ratio is 2:3?

Back

If the ratio is 2:3, then for every 3 drops of yellow, 2 drops of red are needed. Therefore, for 36 drops of yellow, you would need (2/3) * 36 = 24 drops of red.

Front

What is the formula to convert miles per minute to miles per hour?

Back

To convert miles per minute to miles per hour, multiply the miles per minute by 60.

Front

If Maria runs 1 1/2 miles in 15 minutes, what is her speed in miles per hour?

Back

Maria's speed is (1.5 miles ÷ 15 minutes) * 60 = 6 miles per hour.

Front

What does it mean if two quantities are proportional?

Back

Two quantities are proportional if they maintain a constant ratio to each other.