Solving Proportions

Front

What is a proportion?

Back

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

Tags

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

What does it mean for two ratios to form a proportion?

Back

Two ratios form a proportion if their cross products are equal.

Tags

CCSS.7.RP.A.2A

Front

If a/b = c/d, what is the cross-multiplication?

Back

The cross-multiplication is a*d = b*c.

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CCSS.5.NF.B.5B

Front

Solve the proportion: 3/4 = x/12

Back

x = 9.

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CCSS.7.RP.A.2B

Front

Solve the proportion: 5/x = 15/12

Back

x = 4.

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CCSS.7.RP.A.2C

Front

What is the first step in solving a proportion?

Back

The first step is to set the two ratios equal to each other.

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CCSS.7.RP.A.3

Front

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

Back

x = 6.

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CCSS.7.RP.A.2B

Front

What is the relationship between equivalent ratios?

Back

Equivalent ratios are ratios that express the same relationship between numbers.

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CCSS.6.RP.A.3A

Front

Solve the proportion: 8/10 = x/25

Back

x = 20.

Tags

CCSS.7.RP.A.2B