Ratios
There are 6 striped boxes and 3 black boxes. What is the ratio of black boxes to striped boxes? State the ratio three different ways.
3:6, 1/2, 3 to 6
Find the value of n in the following proportion: 4:3 and n:15.
n=20
Convert 12 feet to inches (12 inches/ft).
144 inches
If 15 books cost $90, what is the unit price (cost of one book)?
$6 per book
Marina runs 3 miles in 24 minutes and Sam runs 2 miles in 18 minutes. Who runs at a quicker rate? Explain.
Marina
8 min/mile vs. 9 min/mile
Find the value of n in the following proportion: n:15 and 12:18.
n=10
What is 9 meters in kilometers?
0.009 kilometers
The unit price of hot dogs is $.50/hot dog. How much will 12 hot dogs cost?
$6
Apples are on sale for 6 for $3.60. What is the unit rate of the apples?
$.60 per apple
In the student council election, Iliya received 60 votes, Krishna received 40 votes, and Elijah received 50 votes. What is the ratio of Elijah's votes to the total votes?
50:150 or 1/3
Seventh grade is going on a field trip and they need 2 chaperones for every 25 students on a field trip. There are 100 students going on the field trip. How many chaperones does the school need?
8 chaperones
How many pints are in 6 cups (0.5 pints/cup)?
3 pints
An airplane can fly at a rate of 600 miles per hour. How fast does the airplane travel per minute?
Is it cheaper to buy a 32oz bag of ruffles for $2.60 or a 48oz bag of ruffles for $3.56? Explain.
48oz bag of ruffles
$0.07/oz vs. $0.08/oz
If 8 donuts cost 12.50€, how much do 2 donuts cost?
3.13€
It costs $36 for 5 hotdogs. What does it cost for 2 hotdogs?
$14.40
How many feet are in 4 miles (5,280 ft/mile)?
21,120 feet
Luca bought 4 pairs of jeans for $71.40. How much would he pay for 3 pairs at the same rate?
$53.55
A tomato plant grew 4 inches over 10 months and a bell pepper plant grew 3 inches over 9 months. Which plant grew at a faster rate? Explain.
Tomato plant
Bell Pepper: 3 months/inch
Tomato: 2.5 months/in
What is a ratio?
A comparison of 2 numbers.
The scale in a drawing is 6 cm : 1 foot. If the width of a rug is 2.5 feet, what is the width of the rug in the scale drawing?
15 cm
How many centimeters are in 4 kilometers?
400,000 cm
What is a unit rate?
A comparison of two numbers with different units, where one of those numbers is a one.
You can buy 8 kiwis at Spar for $1.45. You can buy 6 of the same kiwis at Billa for $1.22. Which store offers the better deal? Explain.
Spar
$0.18/kiwi vs. $0.20/kiwi