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Unit Rate and Unit
Cost
Honors Math – Grade 6
Problem of the Day
The price list at the right shows the sale
prices for DVDs in three different video
stores. Which store has the better
buy?
To find the better buy, find the unit rate. Then compare unit rates.
KEY CONCEPT
Rate
A rate is a ratio that compares two unlike quantities.
A unit rate is a ratio that is simplified to have a denominator
of 1 unit. It compares an amount, x, to one unit…
A unit cost is the price per unit of an item.
Write a ratio for each situation.
Find the unit rate for Abe’s DVDs
Find the unit rate for DVD
Exchange.
Find the unit rate for DVD City.
Express each as a unit rate.
70 minutes to stock 14 shelves
140 miles on 4 gal of gas
720 words in 60 lines
5 oranges for $1.20
Express each as a unit rate.
$6.00 for 12 lb of spaghetti
4 quarts of soup for $3.80
Which is the better buy?
Find the better buy.
3 pt for $1.08 or 5 pt for $1.95
3 cans for $4 or 4 cans for $5.50
A 30-ounce jar of salad dressing costs $2.39. A 24-ounce jar
costs $2.14 and a 13-ounce jar costs $1.42. To the nearest cent,
what is the cost per ounce of each size jar? Which is the best
buy?
30-ounce jar
24-ounce jar
13-ounce jar