What are the requirements to have Mathematics as a second teachable?
You need to have at least 18 credit hours in Mathematics. Courses taught in a mathematics department are obviously acceptable (except in cases where computer science courses are taught in a mathematics department). Courses with significant mathematical content taught in other departments might be acceptable, but no more that 6 credit hours can be from such “cognate” courses and the acceptability of the courses will be determined at the time of admissions.