Front

What is a ratio?

Back

A ratio is a comparison of two quantities by division, showing how many times one value contains or is contained within the other.

Tags

CCSS.6.RP.A.1

CCSS.6.RP.A.2

Front

What is a rate?

Back

A rate is a specific kind of ratio that compares two different units, such as miles per hour or price per item.

Tags

CCSS.6.RP.A.1

CCSS.6.RP.A.2

Front

What is a unit rate?

Back

A unit rate is a rate in which the second quantity is one unit, such as 60 miles per hour or 5 dollars per item.

Tags

CCSS.6.RP.A.1

CCSS.6.RP.A.2

Front

What is a proportion?

Back

A proportion is an equation that states that two ratios are equal, often written in the form a/b = c/d.

Tags

CCSS.7.RP.A.2B

Front

How do you find the unit rate from a total distance and total gallons of gas?

Back

Divide the total distance by the total gallons of gas. For example, if you drive 92 miles using 4 gallons, the unit rate is 92 ÷ 4 = 23 miles per gallon.

Tags

CCSS.6.RP.A.1

CCSS.6.RP.A.2

Front

If the ratio of dogs to cats is 5 to 3 and there are 25 dogs, how many cats are there?

Back

Set up the proportion 5/3 = 25/c. Cross-multiply to find c = 15.

Tags

CCSS.7.RP.A.2C

Front

What is the formula to solve for a missing value in a proportion?

Back

If a/b = c/d, then ad = bc. You can solve for the missing value by cross-multiplying.

Tags

CCSS.7.RP.A.2C

Front

How do you calculate the unit rate of calories per serving?

Back

Divide the total calories by the number of servings. For example, 624 calories in 3 servings gives 624 ÷ 3 = 208 calories per serving.

Tags

CCSS.6.RP.A.1

CCSS.6.RP.A.2

Front

What does it mean if two ratios are equivalent?

Back

It means that they represent the same relationship between quantities, and can be expressed as a proportion.

Tags

CCSS.6.RP.A.3A

Front

What is the first step in solving a proportion?

Back

Identify the two ratios and set them equal to each other.

Tags

CCSS.7.RP.A.3