Ratios and Proportions

What is a Ratio?

• comparison of two quantities 

• multiply two fractions 

• number over another number

• Two decimals that can be multiplied

Is this proportion equal?
4/5  20/25

• =

• ≠

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

• 3
• 5.3
• 1.08
• 27

Write a ratio in simplest form:
10 automobiles to 13 bikes

• 1/3

• 10/13

• 4/5

• 3/1

Is this proportion equal?
2/7     24/86

• =

• ≠

Is this proportion equal?
1/3     4/12

• =

• ≠

Solve:
7/n  =  14/10

• 5

• 7

• 70

• 4

Solve:
11/13  =  n/39

• 33

• 3

• 25

• 9

Ella has 5 balloons. Taylor has 7 balloons. Write the ratio of Ella's balloons to Taylor's balloons.

• 7:5

• 5:7

• 3:5

• 5:3