Solving Proportions

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

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

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

Back

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

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CCSS.5.NF.B.5B

Front

What is the first step in solving the proportion 3/x = 6/12?

Back

Cross-multiply to get 3*12 = 6*x.

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CCSS.7.RP.A.2C

Front

What is the solution to the proportion 4/x = 8/16?

Back

x = 2.

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CCSS.7.RP.A.2C

Front

If 5/10 = x/20, what is the value of x?

Back

x = 10.

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CCSS.3.NF.A.3B

CCSS.4.NF.A.1

Front

Gracie brought 24 cookies for 3 classes. How many cookies per class?

Back

8 cookies per class.

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CCSS.3.OA.A.3

Front

If Gracie has 4 classes tomorrow, how many cookies should she bring?

Back

32 cookies.

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CCSS.3.OA.A.3

Front

If I need 5 cups of flour for 3 pies, how many cups for 1 pie?

Back

1.67 cups of flour.

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CCSS.6.RP.A.1

CCSS.6.RP.A.2

Front

How many pies can I make with 25 cups of flour if 5 cups are needed for 3 pies?

Back

15 pies.

Tags

CCSS.6.RP.A.3B