Proportions and Cross Multiply

What strategy can we use to solve for the unknown value?

• cross multiply divide

• cross divide multiply

What is a proportion?

• two equivalent ratios

• a ratio that includes a percent

Solve the proportions (cross multiply and divide)

• 25

• 19.2

• 3.33

• 52

Solve the proportions (cross multiply and divide)

• 5.3

• 72

• 27

• 3

Solve the proportions (cross multiply and divide)

• 121

• 63

• 9

• 36

Solve the proportions (cross multiply and divide)

• 84

• 48

• 5.25

• 43

Solve the proportions (cross multiply and divide)

• 161

• 12

• 21

• 3

Solve the proportions (cross multiply and divide)

• 5.5

• 81

• 18

• 72

Solve the proportions (cross multiply and divide)

• 32

• 12.5

• 50

• 23

Create a proportion and solve.

(remember to put the same labels next to each other)

• 47 gallons

• 21,428 minutes

• 47 minutes

• 26.25 gallons