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 solve for the unknown variable.

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CCSS.7.RP.A.2C

Front

If 4/8 = x/16, what is x?

Back

x = 8.

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CCSS.3.NF.A.3B

CCSS.4.NF.A.1

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

If 3/5 = x/20, how do you find x?

Back

Cross-multiply: 3 * 20 = 5 * x, so x = 12.

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CCSS.7.RP.A.3

Front

What is the relationship between equivalent ratios?

Back

Equivalent ratios represent the same relationship between two quantities.

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CCSS.6.RP.A.3A

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

How many baseball cards can Troy buy with $9 if each card costs $0.50?

Back

Troy can buy 18 baseball cards.

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CCSS.7.EE.B.3

Front

What is the formula for finding a missing value in a proportion?

Back

If a/b = c/d, then ad = bc.

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CCSS.7.G.A.1

Front

If 2/3 = x/9, what is x?

Back

x = 6.

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CCSS.7.RP.A.2B