**What is a percentage?**

A percentage is a way to define a part, or fraction of a total.

When we talk about percentages, we should always ask ourselves the following: "the percentage of what?". Saying 50% without specifying 50% of what, makes no sense. However, if we say "the $50\%$ of $80$" is $40$. In summary, the percentage represents what part of $100$ is the number in question.

The percentage symbol is $\%$:

when we want to express that $a\%$

We will write it as: $a \over 100$