Proportions

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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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How do you determine if two ratios form a proportion?

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Cross-multiply the ratios. If the products are equal, the ratios form a proportion.

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CCSS.7.RP.A.2A

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What is the cross-multiplication method?

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

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CCSS.6.RP.A.3A

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CCSS.5.NF.B.5B

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What does it mean if two ratios do not form a proportion?

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It means that the cross-products of the ratios are not equal.

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CCSS.7.RP.A.2A

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Back

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CCSS.7.RP.A.2B

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CCSS.7.RP.A.2C

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CCSS.3.NF.A.3B

CCSS.4.NF.A.1

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What is a ratio?

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A ratio is a comparison of two quantities by division.

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CCSS.6.RP.A.1

CCSS.6.RP.A.2

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How can you express a ratio in fraction form?

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A ratio can be expressed as a fraction by placing the first quantity over the second quantity.

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CCSS.6.RP.A.1

CCSS.6.RP.A.2