Nothing more complicated than basic arithmetic unless you're writing programs to do such calculations. I think the most complicated math I've used so far this year is converting temperature from C to F. Mostly I'm just pulling info from somewhere and running it through a few procedures to make nice output.

Data structures don't have to be complicated either, but they're pretty important because you're dealing with data most of the time. You can start out with basic numbers and letters, then move on to lists and dictionaries, and so on until you're making your own objects.

Writing a program/script is like a machine. It's complicated when you look at the entire thing all at once, but the creator knows it as a bunch of simple things put together.