# Kai calculates that he spends 75 minutes of a school day in science class. If he spends 500 minutes in school, what percent of his school day does Kai spend in science class?

##### 2 Answers

15%.

#### Explanation:

The minutes in science class over total minutes gives the decimal .15. Move the decimal two places to the right to get the percentage. Thus:

#### Explanation:

Percentage is basically a special fraction. What makes it special is that the denominator (bottom number) is always 100.

The other way of writing percentage is to use the symbol %.

This symbol behaves like a unit of measurement but one that is

worth

Example: Consider say 30%. This is the same as

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

The given fraction in the question is:

Note that the units for the bottom number is the same as the units for the top number ie minutes.

But we need the bottom number to be 100.

**For multiply or divide what we do to the bottom we also do to the top if we wish to retain the proportional relationship.**