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Published byAbigayle Mosley Modified over 9 years ago
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Rate/Unit Rate
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What is it? A rate is a special ratio that compares two values with different units. Rates sometimes use the words per and for instead of the word to. Rates can be simplified.
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Rate or No Rate (examples) 16 girls to 24 students 55 miles per hour 4 lemons for $1.00 26 miles per gallon 75 out of $1.00 3 tickets for 50
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What is it? A unit rate is a rate whose denominator is 1 when it is written as a fraction. To change a rate to a unit rate, first write the rate as a fraction and then divide both the numerator and denominator by the denominator.
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Finding Unit Rates Example #1 During exercise, Abby’s heart beats 675 times in 5 minutes. How many times does it beat per minute? ◦Write a rate that compares the heart beats and time. ◦Divide the numerator and denominator by 5. ◦Simplify.
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Example #2 To make 4 large pizza pockets, Paul needs 14 cups of broccoli. How much broccoli does he need for 1 large pizza pocket? ◦Write a rate that compares. ◦Divide the numerator and denominator by the denominator. ◦Simplify.
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Rate of Speed An average rate of speed is the ratio of distance traveled to time. The ratio is a rate because the units being compared are different.
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Example #3 Finding Average Speed The Lawsons want to drive 288 miles to Rainbow Falls in 6 hours. What should their average speed be in miles per hour? ◦Write the rate as a fraction. ◦Divide the numerator and denominator by the denominator.
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