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Math is one of the magic majors in what is called STEM education. Science Technology Engineering and Math.
There is a big push for STEM majors right now for all types of jobs. you might consider taking statistics classes as well because you can combine those acquired skills with anything.
Google "STEM careers" see what grabs you.
Have you considered actuarial science? It involves a lot of math (I'm pretty sure you take courses up until Calculus 3) and you make great money. Accounting is another option--but the downside is that the hours are frequently long (i.e. 50 hrs/wk) if you become a certified public accountant.