Exploring Proportions and Cross Products

What is a proportion?

• A single ratio

• Two equal ratios

• A type of fraction

• A mathematical equation

Tags

CCSS.7.RP.A.2A

How do you verify if two ratios form a proportion using the cross product rule?

• Multiply the diagonals and compare the products

• Multiply across the equals sign

• Divide the numerators by the denominators

• Add the numerators and denominators

Tags

CCSS.7.RP.A.2A

What is the result of applying the cross product rule to 4/5 = 8/10?

• 10 = 10

• 32 = 32

• 40 = 40

• 20 = 20

Tags

CCSS.3.NF.A.3A

CCSS.3.NF.A.3B

CCSS.4.NF.A.1

How can variables be incorporated into proportions?

• By adding them to each ratio

• By setting them equal to each other

• By multiplying diagonal variables

• Variables cannot be included in proportions

Tags

CCSS.7.RP.A.2C

What is the mystery number if 6/8 = 9/n?

• 8

• 6

• 10

• 12

How do you solve for an unknown in a proportion?

• By using the cross product rule

• By adding the ratios together

• By subtracting the known values

• By dividing the ratios

Tags

CCSS.7.RP.A.2C

What shortcut can be used to solve proportions when a calculator is available?

• Multiply the diagonals and add the other number

• Multiply the diagonals and subtract the other number

• Multiply the diagonals and divide by the other number

• There is no shortcut

Tags

CCSS.7.RP.A.3

What is the result of 7 * 3/4 in the shortcut method?

• 4.75

• 5.25

• 6.25

• 5.75

Tags

CCSS.4.NF.B.4B

CCSS.4.NF.B.4C

What does 8 * 3 divided by 12 equal using the shortcut method?

• 3

• 6

• 4

• 2

Tags

CCSS.3.OA.B.5

Using the shortcut method, what is the result of 5 * 5 divided by 2?

• 12.5

• 10.5

• 11.5

• 13.5

Tags

CCSS.5.OA.A.1

CCSS.5.OA.A.2