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 two ratios and set the products equal to each other.

Tags

CCSS.7.RP.A.3

Front

If 4/8 = x/10, what is x?

Back

x = 5.

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CCSS.3.NF.A.3B

CCSS.4.NF.A.1

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.

Tags

CCSS.6.RP.A.3A

Front

If 2 apples cost $20, how much do 5 apples cost?

Back

$50.

Tags

CCSS.6.RP.A.3B

Front

What is a ratio?

Back

A ratio is a comparison of two quantities by division.

Tags

CCSS.6.RP.A.1

CCSS.6.RP.A.2

Front

How can you determine if two ratios form a proportion?

Back

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

Tags

CCSS.7.RP.A.2A

Front

If 3 pounds of hamburger cost $6, how much does 10 pounds cost?

Back

$20.

Tags

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

What does it mean if two ratios are not a proportion?

Back

It means that the cross products of the ratios are not equal.

Tags

CCSS.7.RP.A.2A