Unit Rates and Unit Cost SWBAT write rates; write unit rates; use unit cost to determine the better or best buy; compare rates.

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Presentation transcript:

Unit Rates and Unit Cost SWBAT write rates; write unit rates; use unit cost to determine the better or best buy; compare rates

Discuss in your group How would you solve the following: The price list to the right shows the sale prices of DVDs in three different stores. Which one had the best buy? The price list to the right shows the sale prices of DVDs in three different stores. Which one had the best buy? Abe’s DVD – 3 for $27.99 DVD exchange – 4 for $33 DVD City – 5 for $47.50

Definitions Rate A ratio that compares two unlike quantities A ratio that compares two unlike quantities Speed = Miles: hour Speed = Miles: hour Unit rate A ratio that is simplified to have a denominator of 1 unit A ratio that is simplified to have a denominator of 1 unit 40 mph = ratio of 40 miles: 1 hour 40 mph = ratio of 40 miles: 1 hour Unit cost The price per unit of an item The price per unit of an item

Examples 3 for $ for $33 5 for $ tickets for $ tickets for $ minutes to stock 14 shelves 140 miles on 4 gallons of gas 720 words in 60 lines 5 oranges for $1.20

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