Solving Proportions with Cross Multiplication

What is the first step in solving a proportion using cross multiplication?

• Add the numbers diagonally

• Subtract the numbers

• Cross multiply the numbers

• Divide the numbers

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CCSS.7.RP.A.2

CCSS.7.RP.A.3

In the first example, what is the result of 3 times x?

• 12

• x

• 3

• 3x

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CCSS.6.EE.A.2

CCSS.6.EE.B.6

What is the product of 12 and 5 in the first example?

• 70

• 60

• 80

• 50

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CCSS.7.NS.A.2

CCSS.7.NS.A.3

How do you isolate the variable x in the equation 3x = 60?

• Subtract 3 from both sides

• Multiply both sides by 3

• Add 3 to both sides

• Divide both sides by 3

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CCSS.6.EE.B.7

What is the value of x in the equation 3x = 60?

• 20

• 15

• 30

• 25

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CCSS.7.EE.B.3

CCSS.7.EE.B.4

What should you not get too held up on when using cross multiplication?

• The order of addition

• How to write the variables

• Where to place the equal sign

• Which numbers to multiply first

Tags

CCSS.7.RP.A.2

CCSS.7.RP.A.3

In the second example, what is the result of 33 times 2?

• 66

• 55

• 77

• 88

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CCSS.7.NS.A.2

CCSS.7.NS.A.3

How do you isolate the variable x in the equation 6x = 66?

• Add 6 to both sides

• Divide both sides by 6

• Subtract 6 from both sides

• Multiply both sides by 6

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CCSS.6.EE.B.5

CCSS.6.EE.B.6

CCSS.6.EE.B.7

What is the value of x in the equation 6x = 66?

• 12

• 9

• 11

• 10

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CCSS.7.EE.B.3

CCSS.7.EE.B.4

What are the steps to solve a proportion using cross multiplication?

• Divide the numbers, set them equal, and solve

• Add the numbers, set them equal, and solve

• Cross multiply, set the products equal, and solve

• Subtract the numbers, set them equal, and solve

Tags

CCSS.7.RP.A.2

CCSS.7.RP.A.3