Ratio and Proportions

What is a Ratio?

• It's a comparison of two things
• Multiplying two fractions 
• A number over another number
• Two decimals that can be multiplied

A class has 30 students. 18 are boys. What is the ratio of boys to girls?

• 12:18
• 3:2
• 30:18
• 18:7

88 students for 4 classes

How many students per class?

• 22 students per class

• 24 classes per student

• 25 students per class

• 26 classes per student

If 48 petits fours(type of dessert) will feed 20 people, then how many should Chef Jodie make to feed 100 guests?

• 240

• 960

• 4800

• 480

What is the ratio of red apples to green apples

• 7 apples to 3 green
• 4 red apples to 7 apples
• 4 red apples to 3 green apples
• 3 green apples to 4 red apples

In my fish tank, the ratio of red fish to blue fish is 3:5. There are 20 blue fish. How many red fish are there?

• 18
• 12
• 4
• 15

• 1
• 3
• 9
• 8

Tommy has a bag of LEGOS.  There are 6 yellow, 3 red, and 8 blue LEGOS.  What is the ratio in simplest form of red to yellow LEGOS?

• 1/2
• 6/3
• 2/1
• 3/6

• 3

• 7

• 5

• 10

Solve the proportion.

• p=31.3
• p=308
• p=924
• p=532