When I was in grade school, I pretty much though math ended with addition, subtraction, multiplication and division.
Wow, and I wasn't finished there. In college I discovered calculus, differential equation and partial differential equations. Math is such an expansive subject and is used in almost every aspect of life. We use it to balance out checkbook and measure out our ingredients.
It's used to build buildings and the development of computer programs. The computer I am using to type these does more mathematical expressions per second than I have done in my entire life. Ok, so maybe I am exaggerating, but in the case of super computers like IBM's Blue Gene that is not the case.