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 set up a proportion to solve a problem?

Back

To set up a proportion, you can use the formula a/b = c/d, where a and b are the first ratio, and c and d are the second ratio.

Tags

CCSS.7.RP.A.2C

Front

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

Back

$20

Tags

CCSS.6.RP.A.3B

Front

If Mary saves $17.50 in 3 weeks, how much will she save in 15 weeks?

Back

$87.50

Tags

CCSS.6.NS.B.3

Front

What is the relationship between the quantities in a proportion?

Back

The relationship is that the cross products are equal; for example, in a/b = c/d, then a*d = b*c.

Tags

CCSS.7.RP.A.2A

Front

How do you find an unknown in a proportion?

Back

You can cross-multiply and solve for the unknown.

Tags

CCSS.7.RP.A.2B

Front

If a recipe calls for 1.5 cups of milk for 3 cups of flour, how much milk is needed for 5 cups of flour?

Back

2.5 cups of milk.

Tags

CCSS.6.RP.A.3B

Front

What is the expected number of homes with a computer if 13 out of 20 homes have one on a street with 60 homes?

Back

39 homes.

Tags

CCSS.7.RP.A.3

Front

If a 12-ounce shampoo bottle lasts 16 weeks, how long will an 18-ounce bottle last?

Back

24 weeks.

Tags

CCSS.6.RP.A.3B

Front

What is the formula for finding the unit rate?

Back

The unit rate is found by dividing the numerator by the denominator.

Tags

CCSS.6.RP.A.1

CCSS.6.RP.A.2