Proportions and Cost Calculations

The video tutorial explains the concept of proportions, which are equations that show two ratios or rates are equal. It provides three examples: a simple numerical proportion, a sports-related proportion comparing makes to shots, and a cost-related proportion comparing dollars to pounds. The tutorial emphasizes the importance of understanding proportions and how to set them up correctly without units.

What is the basic form of a proportion equation?

• A - B = C - D

• A + B = C + D

• A * B = C * D

• A / B = C / D

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CCSS.7.RP.A.2A

In the proportion 3/5 = 27/45, what is the value of A?

• 27

• 45

• 5

• 3

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CCSS.7.RP.A.2A

In the proportion 3/5 = 27/45, what is the value of D?

• 5

• 27

• 45

• 3

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CCSS.1.OA.A.1

How many makes are there in the first part of the second example?

• 12

• 9

• 15

• 6

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CCSS.2.OA.C.4

In the second example, what is the total number of shots in the second part?

• 6

• 9

• 12

• 15

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CCSS.6.RP.A.3B

What is the cost per pound in the first part of the third example?

• $0.60

• $0.80

• $1.00

• $1.20

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CCSS.6.RP.A.3B

In the third example, what is the total cost for 12 pounds?

• $4.80

• $7.20

• $9.60

• $2.40

What is the equivalent proportion for $7.20 for 12 lb?

• 7.2/16

• 7.2/12

• 7.2/4

• 7.2/8