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

If a/b = c/d, what is the cross product?

Back

The cross product is ad = bc.

Tags

CCSS.7.RP.A.2A

Front

Solve for x: 2/3 = x/9

Back

x = 6.

Tags

CCSS.3.NF.A.3A

CCSS.3.NF.A.3B

CCSS.4.NF.A.1

Front

What does it mean if two ratios are in proportion?

Back

It means that the two ratios are equivalent, or that they represent the same relationship.

Tags

CCSS.6.RP.A.3A

Front

Solve for k: 4/k = 2/8

Back

k = 16.

Tags

CCSS.7.RP.A.3

Front

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

Back

x = 10.

Tags

CCSS.3.NF.A.3B

CCSS.4.NF.A.1

Front

What is the first step in solving a proportion?

Back

The first step is to cross-multiply.

Tags

CCSS.7.EE.B.3

Front

Solve for x: 3/x = 6/12

Back

x = 6.

Tags

CCSS.7.RP.A.3

Front

What is the relationship between the means and extremes in a proportion?

Back

In a proportion, the product of the means equals the product of the extremes.

Tags

CCSS.7.RP.A.3

Front

If 7/14 = x/28, what is x?

Back

x = 14.

Tags

CCSS.3.NF.A.3B

CCSS.4.NF.A.1