1. Warm Up 1. 2. 3. 4. 5. Solve the proportion: 73 21 420 18 3.5 23.3
Divide. Round answers to the nearest tenth.
5. Solve the proportion:
73 21
3.5
23.3
23.9
23.8
50(17) = 85p
850 = 85p
10 = p

2. Homework Review
Tonights HW: 5.5 pg. 49

3. Lesson Quiz = = Solve each proportion. 1. n = 30 2. n = 16 45 18 n 1224 6 9 = 1.
n = 30 2.
n = 16

4. Students will be able to compute unit rates in order to:
Determine the average speed of travel.
Get the best buy.
Examine beauty.

5. Maximum Speed: 1335 miles per 5 hours. 1335 miles 5 hours
Rate: A comparison of two quantities that have different units.
Maximum Speed:
1335 miles per 5 hours.
1335 miles 5 hours
Bugatti Veyron: Fastest car in the world according to supercars.org

6. Maximum Speed: 267 miles per 1 hours. 267 miles 1 hour
Unit Rate: Rate in which the second quantity is one.
Maximum Speed:
267 miles per 1 hours.
267 miles 1 hour
Bugatti Veyron: Fastest car in the world according to supercars.org

7. In order to find the unit rate….
Rate Unit Rate
1335 miles 5 hours
267 miles 1 hour
divide the numerator by the denominator.

8. How fast does the second fastest car go if it travels 771 miles per 3 hours?

9. A driver is competing in a 500-mile auto race.
In the first 2 hours of the race, the driver travels 356 miles. What is the driver's average speed? =
356 mi
2 h
= 178 mi/h
Divide to find the unit rate.
The driver's average speed is 178 mi/h.

10. Find Unit Rates
$60 for 15 hours.
400 words in 10 minutes
30 students for 3 computers.
330 miles in 6 hours.
800 meters in 25 seconds.
$4 per hour
40 words per minute
10 students per computer
55 minutes per hour
32 meters per second

11. Unit Price It’s all about bargain shopping
Unit price is a unit rate used to compare price per item.

12. Which is the better buy?

13. 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 $ Which is the better buy?
Divide the price by the number of ounces.
price for jar
number of ounces
$2.19 15 = 
$0.15
price for jar
number of ounces
$2.78 20 = 
$0.14
The better buy is the 20-oz jar for $2.78.

14. 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.

15. Determine the better buy.
1) A half dozen carnations for $4.75 or a dozen for $9.24
2) 15 collector cards for $2.75 or 80 for $13.00
3) 16 oz box of cereal for $3.49 or a 6 oz box of cereal for $1.25
a dozen for $9.24
80 for $13
6 oz box for $1.25

16. Try These!
1. Jacob can buy a 32 oz bottle of BBQ sauce for $2.93 or a 36 oz bottle for $ Which is the better buy?
36 oz
8 pencils
$3.57
$52.67 f
2. John can buy a 8 pencils for $1.25 or a 12 pencils for $ Which is the better buy?
3. Mary made $25.00 for working 7 hours at the mall. How much did Mary make per hour?
4. Lisa paid $ for 3 pair of jeans. What did Lisa pay for each pair of jeans?
5. Bob typed 593 words in 4 minutes. How many words did Bob type per minute?