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Example 2-4c Objective Determine unit rates

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Example 2-4c Vocabulary Rate A ratio that compares two quantities with different kinds of units

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Example 2-4c Vocabulary Unit rate When a rate is simplified so that it has a denominator of 1 unit

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Lesson 2 Contents Example 1Find a Unit Rate Example 2Find Unit Rates Example 3Find Unit Rates Example 4Choose the Best Buy

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Example 2-1a READING Julia read 52 pages in 2 hours. What is the average number of pages she read per hour? Divide the numerator by the denominator Answer: Write the rate as a fraction 1/4 Notice: Time is in the denominator 2 Unit Rate always has a denominator of 1

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Example 2-1b SKATING Kyle skated 16 laps around the ice rink in 4 minutes. What is the average number of laps he skated per minute? Answer: 4 laps 1 minute 1/4

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Example 2-2a Write 440 miles in 8 hours as a unit rate in miles per hour. Answer: Write the rate as a fraction. 2/4 Notice: Time is in the denominator Divide the numerator by the denominator 8

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Example 2-2d Write 455 miles in 7 hours as a unit rate in miles per hour. Answer: 65 miles 1 hour 2/4

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Example 2-3a Find the unit price per can if it costs $3 for 6 cans of soda. Since it is money, round to the nearest hundredth if necessary. Answer: Write the rate as a fraction. 3/4 Notice: Money is in the numerator Divide the numerator by the denominator 6

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Example 2-3b Find the unit price per cookie if it costs $3 for one dozen cookies. Round to the nearest hundredth if necessary. Answer: $0.25 1 cookie 3/4

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Example 2-4a The costs of different sizes of orange juice are shown in the table. Which container costs the least per ounce? AmountTotal Cost 16 oz$1.28 32 oz$1.92 64 oz$2.56 96 oz$3.36 4/4 Must find the unit rate of each item Remember: Money is always in the numerator cost ounce Write the rate as a fraction. $1.28 16 oz Divide the numerator by the denominator $0.08 1 oz

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Example 2-4a AmountTotal Cost 16 oz$1.28 32 oz$1.92 64 oz$2.56 96 oz$3.36 4/4 Must find the unit rate of each item Remember: Money is always in the numerator cost ounce Write the rate as a fraction. $1.92 32 oz Divide the numerator by the denominator $0.06 1 oz 16 oz = $0.08

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Example 2-4a AmountTotal Cost 16 oz$1.28 32 oz$1.92 64 oz$2.56 96 oz$3.36 4/4 Must find the unit rate of each item Remember: Money is always in the numerator cost ounce Write the rate as a fraction. $2.56 64 oz Divide the numerator by the denominator $0.04 1 oz 16 oz = $0.08 32 oz = $0.06

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Example 2-4a AmountTotal Cost 16 oz$1.28 32 oz$1.92 64 oz$2.56 96 oz$4.80 4/4 Must find the unit rate of each item Remember: Money is always in the numerator cost ounce Write the rate as a fraction. $4.80 96 oz Divide the numerator by the denominator $0.05 1 oz 16 oz = $0.08 32 oz = $0.06 64 oz = $0.04

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Example 2-4a AmountTotal Cost 16 oz$1.28 32 oz$1.92 64 oz$2.56 96 oz$4.80 4/4 Compare the cost per ounce of each size and identify the smallest price 16 oz = $0.08 32 oz = $0.06 64 oz = $0.04 96 oz = $0.05 Which container costs the least per ounce? Answer: The 64-ounce container Answer based on what the question is asking

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Example 2-4c The costs of different sizes of bottles of laundry detergent are shown below. Which bottle costs the least per ounce? AmountTotal Cost 16 oz $3.12 32 oz $5.04 64 oz $7.04 96 oz$11.52 Answer: 64-ounce bottle * 4/4

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End of Lesson 2 Assignment Lesson 7:2Rates4 - 21 All

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