Ratios and Proportions Review

Ratios

• A ratio is a comparison of two numbers. We generally separate the two numbers in the ratio with a colon (:).

  
  

  
  

• Suppose we want to write the ratio of 8 and 12. We can write this as 8:12 or as a fraction 8/12, and we say the ratio is eight to twelve.

Proportions

• A proportion is an equation with a ratio on each side.

• It is a statement that two ratios are equal. 

  
  

• 3/4 = 6/8 is an example of a proportion.

Multiple Select

Ratios can be written which of the following ways?

• Using colons

• Using periods

• Using the word "to"

• Written as a fraction

• Using question marks

Multiple Choice

Which pair of ratios ARE equivalent?

• 72 to 64 and 27 to 24

• 25:10 and 10 to 4

• 6:7 and 30:35

• 7.5 to 18 and 5 to 1

Multiple Choice

If there are 3 frogs at a pond and 12 toads, what is the ratio of frogs to toads at the pond?

• 3:4

• 4:1

• 1:4

• 1:3

• 2:3

Multiple Choice

• F

• G

• H

• J

Multiple Choice

• A

• B

• C

• D

Multiple Choice

• F

• G

• H

• J

Multiple Choice

• $$1\frac{1}{2}$$

• $$\frac{6}{9}$$

• $$\frac{6}{7}$$

• none of the these

Multiple Choice

• A

• B

• C

• D