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

If 2/3 = x/12, what is x?

Back

x = 8.

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CCSS.7.RP.A.2B

Front

What is the cross-multiplication method?

Back

The cross-multiplication method involves multiplying the numerator of one ratio by the denominator of the other ratio.

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CCSS.6.RP.A.3A

Front

If a recipe requires 2 cups of flour for 4 servings, how much flour is needed for 10 servings?

Back

5 cups of flour.

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CCSS.6.RP.A.3B

Front

What is the formula for finding a missing value in a proportion?

Back

If a/b = c/d, then ad = bc.

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CCSS.7.G.A.1

Front

If 5/8 = x/32, what is x?

Back

x = 20.

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CCSS.4.NF.B.4B

CCSS.4.NF.B.4C

Front

What is a unit rate?

Back

A unit rate is a ratio that compares a quantity to one unit of another quantity.

Tags

CCSS.6.RP.A.1

CCSS.6.RP.A.2

Front

If a car travels 150 miles in 3 hours, what is the unit rate in miles per hour?

Back

50 miles per hour.

Tags

CCSS.6.RP.A.1

CCSS.6.RP.A.2

Front

How can proportions be used in real-life situations?

Back

Proportions can be used to scale recipes, calculate distances, and compare prices.

Tags

CCSS.7.RP.A.3