Math: Ratio & Rates

Ratios

100

In a drawing, there are three circles, four stars, and three triangles. What is the ratio of stars to the total number of shapes.

What is 2/5 or 4/10

200

Write a rate for this situation: 310 heartbeats in 5 minutes

310 to 5     or   62 to 1

300

There are 3 white rabbits and 9 grey rabbits in a cage. Write the ratio of white rabbits to the total number of rabbits.

3 to 12    or    1 to 4

400

The recipe calls for 2 eggs for every 8 cups of flour. How many eggs are needed with 40 cups of flour?

10 eggs

500

There are 20 pink mice in a cage. The ratio of pink mice to black mice is 2:3. How many black mice are in the cage?

30 black mice

Unit Rate

100

George read 126 pages of a book in 18 minutes. How many pages did he read in 1 minute?

7 pages per minute

200

The science materials cost $65.70 to do the experiment. If 9 students participated in the experiment, what was the unit cost per student?

$7.30

300

The toys cost $69.95 for 5 models. What is the unit rate for each model toy?

$13.99 per model toy

400

A factory can produce mousetraps at a rate of 1500 traps in 3 hours. What is the unit rate per hour?

500 traps per hour

500

Hillary earned $45 babysitting. If she babysat for 6 hours, what was her rate per hour?

$7.50 per hour