Solving Proportions

Front

What is a proportion?

Back

A proportion is an equation that states that two ratios are equal.

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CCSS.7.RP.A.2A

Front

How do you solve a proportion?

Back

To solve a proportion, cross-multiply the terms and then isolate the variable.

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CCSS.6.EE.B.7

Front

If 36 baseball cards cost $18, what is the cost per card?

Back

The cost per card is $0.50.

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CCSS.6.RP.A.1

CCSS.6.RP.A.2

Front

If Troy has $9, how many baseball cards can he buy at $0.50 each?

Back

Troy can buy 18 baseball cards.

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CCSS.3.OA.A.3

Front

What is the cross-multiplication method?

Back

The cross-multiplication method involves multiplying the numerator of one ratio by the denominator of the other ratio.

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CCSS.6.RP.A.3A

Front

Solve the proportion: 3/4 = x/12. What is x?

Back

x = 9.

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CCSS.7.RP.A.2B

Front

What does it mean if two ratios are equivalent?

Back

It means that they represent the same relationship between quantities.

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CCSS.6.RP.A.3A

Front

If x/5 = 3/15, what is the value of x?

Back

x = 1.

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CCSS.7.RP.A.2B

Front

What is the first step in solving the equation 2x = 10?

Back

Divide both sides by 2.

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CCSS.6.EE.B.7

Front

If 5/8 = x/32, what is x?

Back

x = 20.

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CCSS.4.NF.B.4B

CCSS.4.NF.B.4C