[DerpDerpDerp]

I know a number of math teachers who have undergraduate degrees in math, and then attended a 2 year masters program to get their degree in teaching.

I also know a number who came from a humanities background, and "learned enough math" in the single, poorly taught math-for-teaching class they had in getting a masters.

One of these groups makes better teachers (and likely has a wider career path, because of the undergraduate degree).

[chrisBob]

I also know some smart teachers that started with something else and ended up teaching high school. I have more examples of people who got a degree in something else and wanted to teach, but then found out how hard and expensive that transition is.