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Warm Up Divide. Round answers to the nearest tenth. 1. 2. 3. 4.

420 18. 73 21. 430 18. 380 16. Warm Up Divide. Round answers to the nearest tenth. 1. 2. 3. 4. 23.3. 3.5. 23.9. 23.8. Learn to work with rates and ratios. A rate is a comparison of two quantities that have different units. 90 3. Ratio:. Read as “90 miles per 3 hours.”.

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Warm Up Divide. Round answers to the nearest tenth. 1. 2. 3. 4.

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  1. 420 18 73 21 430 18 380 16 Warm Up Divide. Round answers to the nearest tenth. 1.2. 3.4. 23.3 3.5 23.9 23.8

  2. Learn to work with rates and ratios.

  3. A rate is a comparison of two quantities that have different units. 90 3 Ratio: Read as “90 miles per 3 hours.” 90 miles 3 hours Rate:

  4. 90 3 The ratio can be simplified by dividing: Unit rates are rates in which the second quantity is 1. 90 3 30 1 = 30 miles, 1 hour unit rate: or 30 mi/h

  5. 30 words minute 1 2 30 words • 2 minute • 2 1 2 Additional Example 1: Finding Unit Rates Geoff can type 30 words in half a minute. How many words can he type in 1 minute? Write a rate. Multiply to find words per minute. 60 words 1 minute = Geoff can type 60 words in one minute.

  6. Check It Out: Example 1 Penelope can type 90 words in 2 minutes. How many words can she type in 1 minute? 90 words 2 minutes Write a rate. Divide to find words per minute. 90 words ÷ 2 2 minutes ÷ 2 45 words 1 minute = Penelope can type 45 words in one minute.

  7. Unit price is a unit rate used to compare price per item.

  8. price for jar number of ounces price for jar number of ounces Additional Example 4: Finding Unit Prices to Compare Costs Jamie can buy a 15-oz jar of peanut butter for $2.19 or a 20-oz jar for $2.78. Which is the better buy? Divide the price by the number of ounces. $2.19 15 =  $0.15 $2.78 20 =  $0.14 The better buy is the 20-oz jar for $2.78.

  9. Check It Out: Example 4 Golf balls can be purchased in a 3-pack for $4.95 or a 12-pack for $18.95. Which is the better buy? Divide the price by the number of balls. price for package number of balls $4.95 3 =  $1.65 price for package number of balls $18.95 12  = $1.58 The better buy is the 12-pack for $18.95.

  10. Lesson Quizzes Standard Lesson Quiz Lesson Quiz for Student Response Systems

  11. Lesson Quiz: Part I 1. Meka can make 6 bracelets per half hour. How many bracelets can she make in 1 hour? 2. A penny has a mass of 2.5 g and a volume of approximately 0.360 cm3. What is the approximate density of a penny? 3. Melissa is driving to her grandmother's house. In the first 3 hours of the drive, she travels 159 miles. What is Melissa's average speed? ≈ 6.94 g/cm3 12 53 mi/h

  12. Lesson Quiz: Part II Determine the better buy. 5. A half dozen carnations for $4.75 or a dozen for $9.24 a dozen

  13. Lesson Quiz for Student Response Systems 1. John can walk 16 miles in 4 hours. How many miles can he walk in one hour? A. 16 miles B. 8 miles C.4 miles D.2 miles

  14. Lesson Quiz for Student Response Systems 2. Estimate the unit rate. 272 sailors in 17 ships A. 12 sailors per ship B. 14 sailors per ship C.16 sailors per ship D.18 sailors per ship

  15. Lesson Quiz for Student Response Systems 3. Which of the following would be a better buy than purchasing 4 mangoes for $16? A. 2 mangoes for $10 B. half a dozen mangoes for $25 C.8 mangoes for $ 28 D.one dozen mangoes for $54

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