Proportions Simple

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

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

Back

The cross-multiplication rule states that a * d = b * c.

Tags

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

What does it mean if two ratios are in proportion?

Back

It means that the two ratios express the same relationship between their quantities.

Tags

CCSS.6.RP.A.3A

Front

Solve the proportion: 5/x = 15/45

Back

x = 3.

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CCSS.7.RP.A.2C

Front

What is the first step in solving a proportion?

Back

Identify the two ratios and set them equal to each other.

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CCSS.7.RP.A.3

Front

Solve the proportion: 8/10 = x/25

Back

x = 20.

Tags

CCSS.7.RP.A.2B

Front

What is the term for the number that makes a proportion true?

Back

It is called the 'mean' or 'cross product'.

Front

Solve the proportion: 7/14 = x/28

Back

x = 14.

Tags

CCSS.7.RP.A.2B

Front

What is the relationship between the means and extremes in a proportion?

Back

In a proportion a/b = c/d, the means are b and c, and the extremes are a and d.