Understanding Proportions and Equations for Rubber Stamps

The video tutorial explains how to determine the cost of 11 rubber stamps given the cost of 8 stamps. It introduces the problem, sets up variables, and explores different methods to form equations, including proportion, alternative methods, and using reciprocals. The tutorial emphasizes understanding the relationship between the number of stamps and their cost, providing multiple ways to solve the problem.

What is the initial problem discussed in the video?

• Finding the cost of 8 rubber stamps.

• Calculating the total number of stamps.

• Determining the cost of 11 rubber stamps.

• Comparing the cost of different types of stamps.

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CCSS.6.NS.B.3

What is the cost of 8 rubber stamps as mentioned in the video?

• $8.00

• $9.28

• $11.00

• $10.50

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CCSS.6.EE.B.6

What variable is used to represent the cost of 11 rubber stamps?

• c

• z

• y

• x

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CCSS.7.RP.A.3

What is the purpose of setting up a proportion in this context?

• To find the total number of stamps.

• To compare different types of stamps.

• To calculate the average cost per stamp.

• To determine the cost of 11 stamps.

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CCSS.7.RP.A.2C

How is the proportion initially set up in the video?

• 8 stamps to 11 stamps equals 9.28 to x.

• 11 stamps to 8 stamps equals x to 9.28.

• 8 stamps to 9.28 equals 11 stamps to x.

• x to 11 stamps equals 9.28 to 8 stamps.

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CCSS.7.RP.A.2C

Which of the following is NOT a way to set up the proportion equation?

• 8 stamps to 11 stamps equals 9.28 to x.

• 11 stamps to 8 stamps equals x to 9.28.

• 8 stamps to x equals 11 stamps to 9.28.

• x to 11 stamps equals 9.28 to 8 stamps.

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CCSS.7.EE.B.4A

Which operation can be performed on both sides of the equation to create an equivalent equation?

• Multiplying by zero.

• Adding a constant.

• Subtracting a variable.

• Taking the reciprocal.

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CCSS.7.RP.A.3

What mathematical concept is primarily used to solve the problem in the video?

• Addition

• Subtraction

• Proportion

• Division

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CCSS.7.RP.A.3

What is one of the equivalent equations mentioned in the video?

• x over 9.28 equals 11 over 8.

• 11 over x equals 8 over 9.28.

• 9.28 over x equals 8 over 11.

• x over 11 equals 9.28 over 8.

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CCSS.6.EE.B.7

What is the final equivalent equation mentioned in the video?

• x over 9.28 equals 11 over 8.

• 9.28 over x equals 8 over 11.

• 11 over x equals 8 over 9.28.

• x over 11 equals 9.28 over 8.

Tags

CCSS.6.EE.B.7