What is a Ratio
What is a ratio?
A comparison of two quantities
Are the ratios 2:4 and 4:8 equivalent?
Yes
If the ratio of cats to dogs is 3:2, how many dogs are there if there are 15 cats?
10 dogs
A recipe calls for 2 cups of sugar and 3 cups of flour. What is the sugar-to-flour ratio?
2:3
Write a ratio equivalent to 2:3 that uses numbers greater than 20.
22:33 or similar
Write the ratio 3 to 5 in three different ways.
3:5, 3 to 5, or 3/5
Find two equivalent ratios for 5:7
10:14 and 15:21
A bag has 6 red marbles and 4 blue marbles. What is the ratio of red to total marbles?
6:10 or 3:5
If 3 buses are needed to transport 120 students, how many students fit on the bus?
40 students
The ratio of teachers to students is 1:25. If there are 4 teachers, how many students are there?
100 students
If there are 12 apples and 8 oranges, what is the ratio of apples to oranges?
12:8 or 3:5
If a ratio is written as 9:12, what is it in simplest form?
3:4
The school has 120 students and the ratio of boys to girls is 3:5. How many girls are there?
75 girls
The ratio of adults to kids at a park is 1:4. If there are 60 kids, how many adults are there?
15 adults
The ratio of red to green apples is 3:5. If there are 40 apples in total, how many are red?
15 red apples
Explain what is means if a recipe says the ratio of sugar to flour is 2:3.
For every 2 parts of sugar, there are 3 parts of flour.
How do you know if two ratios are equivalent?
By cross-multiplying or simplifying to the same form.
If 8 gallons of paint cover 400 sq. feet, how many sq. feet can 2 gallons cover?
100 Sq ft.
A car travels 60 miles in 2 hours. What is the ratio of miles to hours?
60:2 or 30:1
A blueprint has a ratio of 1 inch to 5 feet. If a room is 3 inches on the blueprint, how many feet long is it in real life?
15 feet
If a basketball team scores 20 points in the first half and 30 points in second half, what is the ratio of first-half points to total points.
20:50 or 2:5
The ratio of boys to girls is 4:5. What are the equivalent ratios if there are 12 boys?
12:15
At a store, the ratio of chocolate to vanilla ice cream sales is 7:3. If 200 ice creams are sold, how many are vanilla?
60 Vanilla
A classroom has 16 boys and 24 girls. What percent of the students are boys?
40%
If a car travels 300 miles in 5 hours, how many miles does it travel in 2 hours?
120 miles