Transcript Ratios and Rates - Gateway School District

COURSE 3 LESSON 5-1
Ratios and Rates
Computer time costs $4.50 for 30 min. What is the
unit rate?
cost
$4.50
=
number of minutes
30 min
Write a rate comparing cost to minutes.
Divide.
= $.15/min
The unit rate is $.15 per minute.
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COURSE 3 LESSON 5-1
Ratios and Rates
Keneesha drove her car 267 mi using 11 gal of gas. Vanessa
drove her car 210 mi using 9 gal. Give the unit rate for each. Which car
got more miles per gallon of gas?
Keneesha
miles
267 mi
=
gallons
11 gal
24.27272727 mi/gal
24.3 mi/gal
Write the rates
comparing
miles to gallons.
Divide.
Round to the
nearest tenth.
Keneesha’s car got more miles per gallon.
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Vanessa
miles
210 mi
=
gallons
9 gal
23.33333333 mi/gal
23.3 mi/gal
COURSE 3 LESSON 5-1
Ratios and Rates
(continued)
Check for Reasonableness 24.3 • 11 = 267.3 and 267.3 267.
Also, 23.3 • 9 = 209.7 and 209.7 210. The answers are reasonable.
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COURSE 3 LESSON 5-1
Ratios and Rates
Express each ratio in simplest form.
1. 27 laps : 81 minutes
1
3
2. 12 minutes : 3 hours
1
15
3. Carli walked 16 miles in 5 hours. Find the unit rate.
3.2 mi/h
4. A 21-oz bottle of shampoo costs $2.80. A 12-oz bottle costs $1.35.
Which has the better unit rate?
12-oz bottle
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