## Characteristics of Rate

## Formative Assessment

# Summary of the Math: Characteristics of Rate

**Read and Discuss**

- Fuel efficiency can be described using two rates: miles per gallon and gallons per mile. More miles per gallon means greater fuel efficiency; but fewer gallons per mile also means greater fuel efficiency.
- Fuel efficiency in miles per gallon (mpg) is a rate. You will find mpg useful for finding how far you can go on any number of gallons of gas.
- Fuel efficiency in gallons per mile (gpm) is also a rate. You will find gpm useful for finding how many gallons of gas you need to go any number of miles.
- The smaller the rate in gpm, the greater the fuel efficiency.
- The rates 20 mpg and 0.05 gpm describe the same situation. They both describe the relationship between 300 miles and 15 gallons.

## Hint:

Can you do the following?

- Explain what
*miles per gallon*and*gallons per mile*mean. - Include the term
*rate*. - Discuss how to define the fuel efficiency of a car.