Unit Rates and Unit CostUnit Rates and Unit CostSWBAT write rates; write unit rates; SWBAT write rates; write unit rates;

use unit cost to determine the better or use unit cost to determine the better or best buy; compare ratesbest buy; compare rates

Discuss in your groupDiscuss in your group

How would you How would you solve the following:solve the following: The price list to the The price list to the

right shows the sale right shows the sale prices of DVDs in prices of DVDs in three different three different stores. Which one stores. Which one had the best buy?had the best buy?

Abe’s DVD – 3 for $27.99

DVD exchange – 4 for $33

DVD City – 5 for $47.50

DefinitionsDefinitions

Rate Rate A ratio that compares two A ratio that compares two unlikeunlike quantities quantities Speed = Miles: hourSpeed = Miles: hour

Unit rate Unit rate A ratio that is simplified to have a denominator A ratio that is simplified to have a denominator

of 1 unitof 1 unit 40 mph = ratio of 40 miles: 1 hour40 mph = ratio of 40 miles: 1 hour

Unit cost Unit cost The price per unit of an itemThe price per unit of an item

ExamplesExamples

3 for $27.993 for $27.994 for $334 for $335 for $47.505 for $47.507 tickets for $42.677 tickets for $42.679 tickets for $63.189 tickets for $63.1870 minutes to stock 14 shelves70 minutes to stock 14 shelves140 miles on 4 gallons of gas140 miles on 4 gallons of gas720 words in 60 lines720 words in 60 lines5 oranges for $1.205 oranges for $1.20

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