I don't know if I'm doing a maths major as such. I'll end up doing about of quarter of my units as advanced maths, which technically qualifies for a major at ANU...
Anyway, maths goes great with science. Biologists always need mathematicians to interpret their data (because they don't know any maths haha). Physics, chemistry... they all work. Except for biology, there's too much I'd have to learn to do scientific modelling, so they are kind of out for me.
There is also abstract scientific modelling... working with the data and equations already given to you... typically involves some level of computing, though.
Which brings me to computing... I'm doing a double major in computer science, so that's where my maths skills are going to be used. I'm doing/going to do things like advanced matrix computations and high performance computation. Won't really be doing any pure maths in 3rd year.
And also if you're any good at computing, you can get well-paying jobs in graphics programmingn (science, games, movies, etc): you need more maths then most programmers and like in biology, the average computer scientist doesn't do maths (strangely enough).
What I plan to do:
- Graphics programming (for science visualisation or computer games)
- Scientific modelling (either abstract or learn some bioinformatics)