A rate is a ratio that compares two quantities measured in different units. For example, a certain species of bamboo grows $27$ feet in height in $2$ years. Then, $\frac{27\text{ ft}}{2\text{ years}}$ is its rate of growth. Here are some other possible examples of rate. Rates might be most useful when finding how much of something is per $1$ 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 $20$ Pokémon every $10$ days.	$20$ Pokémon per $10$ days, $10$ Pokémon per $5$ days	$2$ Pokémon per $1$ day, $730$ Pokémon per $1$ year
At a party, $42$ candies were eaten by $6$ kids.	$42$ candies per $6$ kids, $21$ candies per $3$ kids	$7$ candies per $1$ kid