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# 7 2 Rates

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### 7 2 Rates

1. 1. Comparing CD Prices 7-2 Rates
2. 2. Turn and Talk <ul><li>What would you do with \$1000? </li></ul><ul><li>What if you had to share it with your group? </li></ul><ul><li>What if you had to share it with your class? </li></ul><ul><li>\$1000/26 people </li></ul><ul><li>That is a rate---it compares 2 quantities with different units. What are some other rates? </li></ul>
3. 3. <ul><li>The ads use rates to describe sale prices. To compare prices in sales such as these, it’s often useful to find a unit rate. A Unit Rate is a rate in which one of the numbers being compared is 1 unit. </li></ul>CD SALE!!!! 5 for 49.95 HUGE SAVINGS!!! All discs on sale! 7 for \$65.80
4. 4. <ul><li>The comparisons “45 miles per gallon,” “\$3.50 per hour,” “8.5 kilometers per hour,” and “two sandwiches for each person” are all unit rates. “Per gallon” means “for one gallon” and “per hour” means “for one hour.” </li></ul>
5. 5. <ul><li>Which store has the lower price per CD? </li></ul>CD SALE!!!! 5 for 49.95 HUGE SAVINGS!!! All discs on sale! 7 for \$65.80
6. 6. <ul><li>What is the unit price for both stores? </li></ul>CD SALE!!!! 5 for 49.95 HUGE SAVINGS!!! All discs on sale! 7 for \$65.80
7. 7. <ul><li>Dario has two options for buying boxes of pasta. At Corner Market he can buy seven boxes of pasta for \$6. at Super Foods he can buy six boxes of pasta for \$5. </li></ul><ul><li>At Corner Market he divided 7 by 6 and got 1.16666667. He then divided 6 by 7 and got 0.85714286. He was confused. What do these numbers tell you about the price of boxes of pasta at Corner Market? </li></ul><ul><li>Decide which makes more sense to you. Use that division strategy to compare the two store prices. Which store offers the better deal. </li></ul>
8. 8. <ul><li>Alison ran 24 miles in 3 hours. What is her average speed in miles per hour? </li></ul>
9. 9. <ul><li>Write 228 feet in 24 seconds as a unit rate in feet per second. </li></ul>
10. 10. <ul><li>Find the unit price per orange if it costs \$2 for six oranges. Round to the nearest hundredth if necessary. </li></ul>
11. 11. your turn: Find each unit rate. Round to the nearest hundredth. <ul><li>300 tickets in 6 days </li></ul><ul><li>220 miles in 8 gallons </li></ul><ul><li>\$3 for 6 cans of soda </li></ul>
12. 12. Choose the best buy <ul><li>The costs of different sizes of peanut butter are shown at the right. Which jar costs the least per ounce? </li></ul>\$10.89 80 oz \$5.30 40 oz \$2.49 12 oz Price Size
13. 13. <ul><li>At the Corner Market store, you can buy eight cans of tomatoes for \$9. The cans are the same size as those at Canned Stuff, which sells six cans for \$5. Are the tomatoes at Corner Market a better buy? </li></ul>
14. 14. 7-2 workbook problems
15. 15. In book # 27 and 28 <ul><li>SLOPE = rate </li></ul>
16. 16. Exit pass <ul><li>Make up a comparison statement and swap with a partner. Choose the best buy. </li></ul>
17. 17. Homework <ul><li>P 294: 1, 3, 10-23, 30, 31 </li></ul>