Cross Multiplying

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What is cross multiplication?

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Cross multiplication is a method used to solve proportions by multiplying the numerator of one fraction by the denominator of the other fraction.

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CCSS.7.RP.A.3

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The setup is: a * d = b * c.

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CCSS.5.NF.B.5B

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n = 8.

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CCSS.3.NF.A.3A

CCSS.3.NF.A.3B

CCSS.4.NF.A.1

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x = 25.

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CCSS.7.RP.A.3

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What is a proportion?

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

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CCSS.7.RP.A.2A

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y = 3.

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CCSS.7.RP.A.2B

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n = 2.5.

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CCSS.4.NF.B.4A

CCSS.4.NF.B.4B

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What does it mean to solve a proportion?

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To solve a proportion means to find the unknown variable that makes the two ratios equal.

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CCSS.7.RP.A.2C

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n = 8.

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CCSS.3.NF.A.3A

CCSS.3.NF.A.3B

CCSS.4.NF.A.1

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What is the first step in cross multiplying?

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The first step is to multiply the numerator of the first fraction by the denominator of the second fraction.

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CCSS.3.NF.A.3A

CCSS.3.NF.A.3B

CCSS.4.NF.A.1