Ratio and Proportions and Geometry

What is a Ratio?

• Is a comparison of two quantities 
• To multiply two fractions 
• A number over another number
• Two decimals that can be multiplied

Which of these ratios is equivalent to 3:4?

• 12:9
• 9:20
• 9:12
• 803:804

A bag of marbles comes with 3 blue marbles, 2 red marbles, and 5 yellow marbles. What is the ratio of red to yellow?

• 2 to 5
• 5 to 3
• 3 to 5
• 5 to 2

Charlie Browns Christmas tree is 18 inches tall. The Christmas tree at Mr.Bass' house is 8 ft tall. What is the ratio of Charlie Browns tree to Mr. Bass' Tree?

• 18/8
• 8/18
• 3/16
• 16/3

Write the ratio of the first measurement to the second measurement.

Length of a classroom:  18 ft 4 in
Length of a closet:  48 in                  

• 55/12
• 12/55
• 9/2
• 2/9

Write the ratio of the first measurement to the second measurement.

Length of the school bus: 9 yd
Length of an SUV: 12 ft              

• 9/4
• 4/9
• 3/4
• 4/3

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

• 12:18
• 3:2
• 30:18
• 18:7

There are 80 students in Mr. Bass’ classes.  The ratio of boys to girls is 2 : 3.
How many boys are in the classes?
How many girls?

• Boys: 32
  Girls: 48
• Boys: 48
  Girls: 32
• Boys: 5
  Girls: 15
• Boys: 15
  Girls: 5

Solve for x
20/5 = x/25

• x=100
• x=4
• x=120
• x=5

Solve for n
12/6 =  4/n

• n=4
• n=2
• n=3
• n=6