Solving Proportions with Scale Factor

What is a proportion in mathematical terms?

• A method to find unknown variables

• Two ratios that are equal to each other

• A comparison of two different units

• A type of equation involving multiplication

Tags

CCSS.7.RP.A.1

CCSS.7.RP.A.2

CCSS.7.RP.A.3

What is the scale factor between 1/2 and 2/4?

• 1

• 2

• 0.5

• 4

Tags

CCSS.7.RP.A.1

CCSS.7.RP.A.2

CCSS.7.RP.A.3

How many minutes will it take Carrie to swim 3000 yards?

• 20 minutes

• 30 minutes

• 25 minutes

• 15 minutes

Tags

CCSS.7.RP.A.1

CCSS.7.RP.A.2

CCSS.7.RP.A.3

What is the scale factor used to find the time for Carrie to swim 3000 yards?

• 2.0

• 0.8

• 1.25

• 1.5

Tags

CCSS.7.RP.A.2

CCSS.7.RP.A.3

How do you calculate the scale factor in Carrie's swimming problem?

• Divide the larger distance by the smaller distance

• Multiply the time by the distance

• Divide the time by the distance

• Divide the larger distance by the time

Tags

CCSS.7.G.A.1

CCSS.7.RP.A.2

What is the cost of 13 sodas if 5 sodas cost $4.50?

• $11.70

• $13.00

• $10.50

• $9.00

Tags

CCSS.7.NS.A.3

CCSS.7.RP.A.2

CCSS.7.RP.A.3

What scale factor relates the cost of 5 sodas to 13 sodas?

• 2.6

• 2.0

• 1.5

• 3.0

Tags

CCSS.7.RP.A.2

CCSS.7.RP.A.3

How is the scale factor calculated in the soda cost problem?

• Divide 13 by 5

• Add the cost of 5 sodas to the cost of 13 sodas

• Divide the number of sodas by the cost

• Multiply the cost by the number of sodas

Tags

CCSS.7.EE.B.3

CCSS.7.NS.A.3

CCSS.7.RP.A.2

CCSS.7.RP.A.3

What is the correct way to set up a proportion for the soda cost problem?

• Cost per soda over total cost

• Total cost over number of sodas

• Cost of 5 sodas over cost of 13 sodas

• Number of sodas over total cost

Tags

CCSS.7.RP.A.2

CCSS.7.RP.A.3

How do you find the missing value in a proportion?

• Multiply the known ratio by the scale factor

• Divide known values

• Subtract known values

• Add the known values

Tags

CCSS.7.RP.A.2

CCSS.7.RP.A.3