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

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

If Mary saved $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 ratio of boys to girls if there are 12 boys and 8 girls?

Back

The ratio is 3:2.

Tags

CCSS.6.RP.A.1

CCSS.6.RP.A.2

Front

If a recipe calls for 1.5 cups of milk for every 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 relationship between ratios and proportions?

Back

Ratios compare two quantities, while proportions show that two ratios are equal.

Tags

CCSS.6.RP.A.3A

Front

How do you find the total population of a species in a lake using a sample?

Back

Use the formula: (number of species in sample / total number in sample) = (estimated population / total population).

Tags

CCSS.7.RP.A.2C

Front

If Ramon travels 20 miles in 20 minutes, how far can he travel in 120 minutes?

Back

120 miles.

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