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 determine if two ratios form a proportion?

Back

Two ratios form a proportion if the cross products are equal.

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CCSS.7.RP.A.2A

Front

Solve for x: 5/7 = x/28

Back

x = 20

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CCSS.7.RP.A.2B

Front

Solve for x: 3/x = 12/16

Back

x = 4

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CCSS.7.RP.A.2C

Front

If a recipe requires 2 cups of flour for 3 servings, how much flour is needed for 9 servings?

Back

6 cups of flour.

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CCSS.6.RP.A.3B

Front

What is the cross product of the ratios 2/3 and 4/6?

Back

The cross product is 2*6 = 12 and 3*4 = 12, so they are equal.

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CCSS.6.RP.A.3A

Front

If 10 apples cost $5, how much do 25 apples cost?

Back

$12.50.

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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.

Tags

CCSS.7.G.A.1

Front

Solve for x: 8/x = 4/12

Back

x = 6.

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CCSS.7.RP.A.3

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