7th: Lesson 39

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

Back

b = 24

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CCSS.7.RP.A.3

Front

Back

c = 21

Front

Back

a = 9

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CCSS.6.EE.A.1

Front

Back

d = 2

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CCSS.7.RP.A.3

Front

Back

n = 12

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CCSS.3.NF.A.3B

CCSS.4.NF.A.1

Front

What is the cross-multiplication method?

Back

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

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CCSS.7.RP.A.3

Front

Back

The relationship is that a * d = b * c.

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CCSS.3.NF.A.3A

CCSS.3.NF.A.3B

CCSS.4.NF.A.1

Front

What does it mean for two fractions to be equivalent?

Back

Two fractions are equivalent if they represent the same value or proportion.

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CCSS.3.NF.A.3A

CCSS.3.NF.A.3B

CCSS.4.NF.A.1

Front

How can you check if two fractions are equivalent?

Back

You can check by cross-multiplying and seeing if the products are equal.

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CCSS.3.NF.A.3A

CCSS.3.NF.A.3B

CCSS.4.NF.A.1