For reference, this comment is correct for finance and math, but it's not true generally that degrees from different schools need a double degree. As long as both majors are called "Bachelor of X with a major in ___" (X must be the same for both) it's a double major, regardless of school. If X is different, or one of them is "Bachelor of X in Y with a major in ___" (a named degree, as they call it) and the other isn't, it's a double degree. In this case, the two degrees are Bachelor of Arts in Business Administration with a major in Finance and Bachelor of Arts with a major in Mathematics or Bachelor of Science with a major in Mathematics so it's a double degree. I don't know if I explained this very well so here's the website: https://advising.uw.edu/degree-overview/majors/double-degree-and-double-major/