Unit Rates Lesson 6-2.

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Presentation transcript:

Unit Rates Lesson 6-2

Vocabulary A rate is a ratio that compares two quantities measured in different units. The unit rate is the rate for one unit of a given quantity. Unit rates have a denominator of 1.

Examples Rate: 150 heartbeats 2 minutes Unit Rate (Divide to get it): 150 ÷ 2 = 75 heartbeats per minute.

Find the Unit Rate Amy can read 88 pages in 4 hours. What is the unit rate? (How many pages can she read per hour?) 88 pages 22 pages / hour 4 hours

Using Unit Rates You can find the missing terms of equal ratios. Use the unit rate, and set it equal to another ratio. Solve for what is missing by dividing or multiplying.

Example Joe’s car goes 25 miles per gallon of gasoline. How far can it go on 8 gallons of gasoline? x 8 25 miles = Unit Rate 1 gallon 8 gallons x 8 25 x 8 = 200. Joe’s car can go 200 miles on 8 gallons of gas.

Comparing Unit Prices Use division to find the unit prices of the two products in question. The unit rate that is smaller (costs less) is the better value.

Example Juice is sold in two different sizes. A 48-fluid ounce bottle costs $2.07. A 32-fluid ounce bottle costs $1.64. Which is the better buy? $2.07 0.043125 $0.04 per fl.oz. 48 fl.oz. $1.64 $0.05 per fl.oz. 0.05125 32 fl.oz. The 48 fl.oz. bottle is the better value.