Concept

Rate

A rate is a ratio that compares two quantities measured in different units. For example, a certain species of bamboo grows

feet in height in

years. Then,

is its rate of growth. Here are some other possible examples of rate.

Some example rates and the corresponding scenarios

Rates might be most useful when finding how much of something is per

unit of something else. Such a comparison is called a unit rate. If the given rates are not already unit rates, they can be determined by some calculations. Dive deeper into two of the previous examples.

Scenario	Rate	Unit Rate
Kriz finds Pokémon every days.	Pokémon per days, Pokémon per days	Pokémon per day, Pokémon per year
At a party, candies were eaten by kids.	candies per kids, candies per kids	candies per kid

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Finding the Unit Rate

Write the rate of the Pokémon scenario as a fraction to determine its unit rate.

Next, divide both units by the denominator of the fraction to have

day on the denominator. In this case, divide both units by

Since a year has

days, multiply this unit rate per day by

to find the unit rate per year.

The unit rate for the candy per kid can be determined in a similar fashion.

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