Understanding Proportions

What is a proportion?

• A statement that two ratios are equivalent

• A statement that two numbers are equal

• A statement that two numbers are multiplied

• A statement that two fractions are different

How can you verify if two ratios form a proportion?

• By adding them

• By dividing them

• By subtracting them

• By cross-multiplying them

In the first word problem, what are you comparing?

• Blue cars to red cars

• Total cars to red cars

• Red cars to white cars

• Black cars to white cars

What is the missing number of red cars if there are 24 white cars?

• 120

• 72

• 96

• 48

In the second word problem, what is the original total number of cars?

• 30

• 20

• 35

• 25

How many total cars would you expect if there are 18 black cars?

• 80

• 70

• 60

• 50

In the third word problem, what is the total number of cars initially?

• 34

• 32

• 30

• 28

How many total cars would you expect if there are 12 black cars?

• 128

• 100

• 120

• 110

What operation do you perform if the number increases in a proportion problem?

• Division

• Multiplication

• Subtraction

• Addition

What is the key step in solving a proportion problem?

• Using a calculator

• Ignoring the question

• Guessing the answer

• Finding the original ratio