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?
20
4 pencils cost $2. What is the cost per pencil?
$0.50
True or False: If the ratio of triangles to squares is 2:4, then there are twice as many squares as triangles.
True
What does the word “ratio” mean in math?
A comparison of two quantities using division.
Fill in the blank: 5:8 = __:16
10
A recipe uses 4 cups of flour for every 3 cups of sugar. How much sugar for 12 cups of flour?
9 cups
3 sandwiches cost $15. How much do 5 sandwiches cost?
$25
Which statement is correct? (a) 3:6 = 1:2 (b) 3:6 = 2:4
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.
6:8 and 9:12
A class has 12 boys and 16 girls. What is the ratio of girls to total students?
16:28
What does “per” mean in math? Give an example.
“For each”; example: miles per hour.
There are 5 stars and 10 circles. Which ratio shows circles to stars?
10:5
If there are 24 apples and 18 oranges, simplify the ratio of oranges to apples and explain why it’s equivalent.
18:24 simplifies to 3:4 because both numbers are divided by 6.
Complete the table and explain the pattern:
2:3 → __:9 → __:15 → __:30
6:9, 10:15, 20:30
A ribbon is cut to make bows. 7 feet makes 5 bows. How many bows from 56 feet?
40 bows
6 tickets cost $42. What is the cost per ticket and the cost for 15 tickets?
$7 per ticket; $105 for 15 tickets.
If the ratio of smiley faces to triangles is 6:3, how many triangles if there are 18 smiley faces?
9 triangles
A box has 48 pencils and 36 erasers. Write the ratio of pencils to erasers in simplest form and explain what it means in words.
48:36 simplifies to 4:3, meaning for every 4 pencils, there are 3 erasers.
If the ratio of boys to girls is 7:9, write three equivalent ratios and explain how you found them.
14:18, 21:27, 28:36 (multiply by 2, 3, 4)
A class has 18 boys and 12 girls. If 6 more girls join, what is the new ratio of boys to girls?
18:18 or 1:1
A store sells 3 notebooks for $4.50. At this rate, how much will 20 notebooks cost?
$30
A picture shows 2 squares for every triangle. If there are 12 squares, how many triangles?
6 triangles