Ratio Basics
Write the ratio of 8 cats to 12 dogs in three forms.
8:12, 8 to 12, 8/12
Which is equivalent to 2:3? (a) 4:6 (b) 6:8 (c) 8:12
a) 4:6
A bag has red and blue marbles in a ratio of 2:3. If there are 30 blue marbles, how many red marbles?
What is 20?
4 pencils cost $2. What is the cost per pencil?
What is $0.50?
True or False: If the ratio of triangles to squares is 2:4, then there are twice as many squares as triangles.
What is true?
What does the word “ratio” mean in math?
What is a comparison between quantities using division. (Also: a proportional comparison, a way of understanding the relationships between quantities)
Fill in the blank: 5:8 = __:16
What is 10
A recipe uses 4 cups of flour for every 3 cups of sugar. How much sugar for 12 cups of flour?
What is 9 cups?
3 sandwiches cost $15. How much do 5 sandwiches cost?
What is $25?
Which statement is correct? (a) 3:6 = 1:2 (b) 3:6 = 2:4
What is (a) 3:6 = 1:2
Write the ratio of pencils to erasers if there are 15 pencils and 10 erasers.
15:10, 15 to 10, 15/10
If the ratio of boys to girls is 3:4, write two equivalent ratios.
Ex What are 6:8 and 9:12
A class has 12 boys and 16 girls. What is the ratio of girls to total students?
What is 16:28?
What does “per” mean in math? Give an example.
What is “For each”?
example: miles per hour.
There are 5 stars and 10 circles. Which ratio shows circles to stars?
What is 10:5
If there are 20 apples and 5 oranges, what is the ratio of oranges to apples?
5:20, 5 to 20, or 5/20
True or False: 7:9 = 15:17
False
A ribbon is cut to make bows. 5 feet makes 4 bows. How many bows from 25 feet?
What are 20 bows?
6 tickets cost $42. What is the cost per ticket?
What is $7?
If the ratio of smiley faces to triangles is 6:3, how many triangles if there are 18 smiley faces?
What are 9 triangles?
Explain the difference between a ratio and a fraction.
A ratio compares two quantities; a fraction shows part of a whole.
Complete the table:
2:5 → __:10 → __:15
4:10, 6:15
A car travels 120 miles in 3 hours. At this rate, how far in 7 hours?
What is 280 miles?
3 pounds of apples cost $4.50. How much do 8 pounds cost?
$12
A picture shows 2 squares for every triangle. If there are 12 squares, how many triangles?
What are 6 triangles?