1. Bell Quiz

2. Objectives Solve rate and ratio problems.

3. Ratios and Rates A ratio is comparison of two quantities using division. A rate is a ratio that compares quantities measured in different units. A unit rate is a rate whose denominator is 1. A unit price is the cost per unit.

4. Example 1 Finding Unit Rate Which is the better buy: 5 cans of tuna for $4.95 or 6 cans for $5.75?

5. Lesson Practice 1 Which is the better buy: 8 boxes for $4.96 or 5 boxes for $3.25?

6. Example 2 Converting Rates

7. Lesson Practice 2 A bus driver drives at 30 miles per hour. What is the rate of the bus in miles per minute? http://www.youtube.com/watch?v=Qhm7-LEBznk

8. Example 3 Converting Rates An engineer opens a valve that drains 60 gallons of water per minute from a tank. How many quarts were drained per second?

9. Lesson Practice 3 Jamie typed 20 pages of a document in 2 hours. How many pages did she type in 1 minute.

10. Proportions

11. Example 4 Solving Proportions Using Cross Products

12. Lesson Practice 4

13. Example 5 Solving Proportions Using Cross Products

14. Lesson Practice 5

15. Proportions Proportions are used to represent many real- world situations that require finding a missing value. Using the cross products is and efficient method for solving the proportions

16. Example 6 Solving Multi-Step Proportions The ratio of boys to girls in a math class is 3:2. The class has 25 students in all. How many boys and how many girls are in the class.

17. Lesson Practice 6 The ratio of blue chips to red chips in a bag is 5:7. The bag has 60 chips in all. How many blue chips and how many red chips are in the bag?

18. Example 7 Solving Multi-Step Proportions On the map, Albany to Jamestown measures 12.6cm, Jamestown to Springfield measures 9cm, and Springfield to Albany measures 4.75cm. what is the actual distance from Albany to Jamestown to Springfield and back to Albany?

19. Lesson Practice 7 A map shows a 5.5 inch distance between Orange City and Newtown, and a 3.75 inch distance from Newtown to Westville. The scale on the map is 1 inch:100 miles. What is the actual distance, if you drive from orange city via Newtown to Westville?

20. Example 8 Applications: Trucking Mr. Jackson drove a truck 300 miles in 6 hours. If he drives at a constant speed, how long will it take him to drive 450 miles?

21. Lesson Practice 8 If Jeff walks 4 miles in 48 minutes, how far can he walk in 72 minutes?