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Unit Rates Lesson 4. 1. Write the ratio 12 : 18 as a fraction in simplest form 2. The ratio of dogs to cats in a shelter was 4 : 3. a)Explain the meaning.

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Presentation on theme: "Unit Rates Lesson 4. 1. Write the ratio 12 : 18 as a fraction in simplest form 2. The ratio of dogs to cats in a shelter was 4 : 3. a)Explain the meaning."— Presentation transcript:

1 Unit Rates Lesson 4

2 1. Write the ratio 12 : 18 as a fraction in simplest form 2. The ratio of dogs to cats in a shelter was 4 : 3. a)Explain the meaning of this ratio. b)Write the ratio of dogs to total critters in the shelter. 3. Convert to a decimal.

3  Rate: ◦ A ratio of two numbers that have different units  $ per Pound  Miles per Gallon  Miles per Hour  Unit Rate: ◦ A rate with a denominator of 1 The Denominator (bottom #) MUST be 1. Duh how can I do that?

4 Find each unit rate. a. b.  Rewrite the rate so its denominator is 1. 20 miles per hour $4.32 per sandwich

5 An airplane flew 720 miles in 1.5 hours. How fast was it flying in miles per hour?  Write the rate as miles to hours.  Rewrite the rate so its denominator is 1.  The airplane was flying at a rate of 480 miles per hour.

6 A grocery store has a special on jumbo cookies. They are selling 16 jumbo cookies for $5.92. Find the price per cookie.  Write the rate as price to cookies.  Find the unit rate.  Each cookie costs $0.37.

7 Find the unit rate. 1. 2. 3. Sue spent $3.30 for 3 ice cream cones. Dan spent $2.50 for 2 ice cream cones. Who spent less per ice cream cone? A = SueB = Dan Hint: use unit rates.

8 Why would you want to know the miles per gallon your car uses when it is driven? Do you think the unit rate changes if you are driving on a freeway or driving on streets? Why?

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