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 variable.

Tags

CCSS.7.RP.A.2C

Front

What does cross-multiplication mean?

Back

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

Tags

CCSS.3.NF.A.3D

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

What is the first step in solving for x in a proportion?

Back

The first step is to set up the proportion correctly.

Tags

CCSS.6.EE.B.7

Front

Solve for x: 3/x = 6/12

Back

x = 6.

Tags

CCSS.7.RP.A.3

Front

Solve for x: 4/x = 8/16

Back

x = 2.

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CCSS.7.RP.A.3

Front

If 5/x = 10/20, what is x?

Back

x = 10.

Tags

CCSS.7.RP.A.2B

Front

What is the value of x in the proportion 7/x = 14/28?

Back

x = 14.

Tags

CCSS.7.RP.A.2C

Front

If 2/3 = x/9, how do you find x?

Back

Cross-multiply to get 2 * 9 = 3 * x, so x = 6.

Tags

CCSS.3.NF.A.3A

CCSS.3.NF.A.3B

CCSS.4.NF.A.1