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 cross-multiplication mean?

Back

Cross-multiplication involves multiplying the numerator of one ratio by the denominator of the other ratio.

Tags

CCSS.6.RP.A.3A

Front

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

Back

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

Tags

CCSS.5.NF.B.5B

Front

Solve the proportion: 2/3 = x/12

Back

x = 8.

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CCSS.7.RP.A.2B

Front

Solve the proportion: 5/10 = x/20

Back

x = 10.

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CCSS.7.RP.A.2B

Front

What is the value of x in the proportion: 4/x = 8/16?

Back

x = 2.

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CCSS.7.RP.A.2C

Front

If 3/4 = x/20, what is x?

Back

x = 15.

Tags

CCSS.4.NF.B.4B

CCSS.4.NF.B.4C

Front

Solve the proportion: 7/x = 14/28

Back

x = 14.

Tags

CCSS.7.RP.A.2C

Front

What is a ratio?

Back

A ratio is a comparison of two quantities by division.

Tags

CCSS.6.RP.A.1

CCSS.6.RP.A.2