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.

Tags

CCSS.7.RP.A.2A

Front

What is the cross product of the ratios a/b and c/d?

Back

The cross product is ad and bc. If ad = bc, then a/b = c/d is a proportion.

Front

If 2/3 = x/9, what is the value of x?

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 do not form a proportion?

Back

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

Tags

CCSS.7.RP.A.2A

Front

If 4/5 and 8/10 are compared, do they form a proportion?

Back

Yes, they form a proportion because 4*10 = 5*8.

Tags

CCSS.7.RP.A.2A

Front

Solve for x: 3/4 = x/12.

Back

x = 9.

Front

What is the relationship between equivalent ratios and proportions?

Back

Equivalent ratios are ratios that express the same relationship and thus form a proportion.

Tags

CCSS.6.RP.A.3A

Front

If 5/6 = 10/x, what is the value of x?

Back

x = 12.

Tags

CCSS.7.RP.A.2C

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