Ratios
What are the three ways to write a ratio?
as a fraction, with the word "to", with a colon"
If Mimi drives 50 miles in 2 hours, what is her unit rate (speed per hour)?
25 miles per hour
What's the better deal? $20 for 5 t-shirts or $24 for 8 t-shirts
$24 for 8 t-shirts ($3 per shirt)
A swimming pool uses 6,000 quarts of water. How many gallons is that? (4 quarts = 1 gallon)
1,500 gallons
Anna earns $12 in 3 hours. How much does she make in 5 hours?
$20
The book fair had a sale where you could buy 2 books for a total of $16.80. If you wanted to buy 3 books, how much would it cost?
$25.20
If James types 120 words per 3 minutes, what is his unit rate of typing?
40 words per minute
Which is the better buy?
Brand B
Chase measured a line for his art project. The line is 20 centimeters long. How many millimeters is the line? (10 millimeters = 1 centimeter)
200 millimeters
Ramon gets 10 points in 4 games. How many does he get in 6 games?
15 points
Find the missing number:
4 : 7 = 12 : ___
4:7 = 12:21
A car travels 150 miles in 3 hours. At the same rate, how far will it travel in 5 hours?
250 miles
4 CD's for $36 or 6 CD's for $54
They are the SAME! :)
In an election, the voters said yes to the Saturday School in a ratio of 7 to 5. According to this ratio, in a room of 60 people, how many people voted for Saturday School?
35 people voted for Saturday School
If Henry can read 8 pages in 6 minutes, then he can read 4 pages in how many minutes?
3 minutes
Complete the table with equivalent ratios:
Red: Blue:
6 10
12 ____
____ 30
30 ____
20, 18, 50
A printer prints 525 pages in 7.5 minutes. At the same rate, how many pages will it print in 12 minutes?
840 pages
Which is the better buy?
Store A: 3 pounds of apples for $5.40
Store B: 5 pounds of apples for $8.25
Store B
(Think about class on Monday)
Two students solve a better-buy problem using different unit rates.
Student A finds $0.08 per ounce.
Student B finds 12.5 ounces per dollar.
Can both students be correct? Explain how their answers could represent the same deal.
Yes. One is finding cost per ounce, while the other is finding ounces per dollar. They are different ways of expressing the same relationship.
Julia texts 60 words in 4 minutes, then she texts 45 words in how many minutes?
3 minutes
The ratio of boys to girls in a club is 3 : 5. There are 32 students total. How many boys are in the club?
12 boys
A car travels 156 miles in 2.5 hours. At the same rate, how many miles will the car travel in 7.5 hours?
468 miles
A store sells two different sizes of laundry detergent:
Which is the better buy, and how much less does it cost per ounce?
Brand B is the better buy. It costs $0.015 less per ounce.
A road is 6 miles long. A construction crew works at a rate of 2 miles every 3 hours. How many hours will it take the crew to complete the entire road?
9 hours
Ms. Curtis studies 25 hours for 2 tests, and studies 100 hours for how many tests?
8 tests