Circle Talk
What is the formula for circumference?
C = πd or C = 2πr
Write the ratio of 2 dogs to 5 cats as a fraction.
2/5
You walk 3 miles in 1 hour. What is your unit rate in miles per hour?
3 mph
What is 50% of 40?
20
A circle has a radius of 3 m. What is its circumference?
18.84 m
A circle has a diameter of 8 cm. What is its circumference? (Use π ≈ 3.14)
25.12 cm
The ratio of boys to girls in a class is 3:4. If there are 12 boys, how many girls are there?
16
A printer prints 60 pages in 3 minutes. How many pages per minute?
20 pages per minute
Write 0.75 as a fraction in simplest form.
3/4
The ratio of apples to oranges is 2:3. If there are 12 apples, how many oranges are there?
18
A circle has a circumference of 31.4 cm. What is its diameter?
10 cm
Simplify the ratio 18:24.
3:4
A car travels 120 miles in 2 ½ hours. What is the rate in miles per hour?
48 mph
The circumference of a circle is 62.8 cm. What is its radius? (Use π ≈ 3.14)
10 cm
A runner completes 5 miles in 2/3 of an hour. What is the unit rate in miles per hour?
7.5 mph
The ratio of a circle’s circumference to its diameter is always what number?
3.14
A recipe calls for 2 cups of sugar for every 5 cups of flour. If you have 20 cups of flour, how many cups of sugar do you need?
8 cups
A faucet leaks 3/4 gallon every 1/2 hour. What is the unit rate per hour?
1.5 gallons/hour
The ratio of red to blue marbles is 5:7. If there are 60 marbles in total, how many are red?
25
A pizza has a diameter of 16 in. What is its circumference?
50.24 in
A bicycle wheel has a radius of 14 in. What is the circumference? (Use π ≈ 3.14)
87.92 in
A model car is built with a scale of 1:20. If the model is 10 inches long, how long is the real car?
200 in or 16 ft 8 in
A runner completes 5/6 of a mile in 1/10 of an hour. What is the unit rate in miles per hour?
8.33 mph
A bus travels 150 miles in 2.5 hours. What is the unit rate?
60 mph
A train travels 135 miles in 2 ¼ hours. What is the rate in miles per hour?
60 mph