20 year programming career and I've never engaged with math beyond approximately Algebra II, in the real world. Hell, I go years at a time not needing anything trickier than Algebra I.
Nearly all of the math I actually use I learned in the 6th grade or earlier, overwhelmingly elementary school arithmetic—mostly the "bad" kind I got from memorization-based practice that mathematicians seem to hate even though it's a contender for the best bang-for-buck of almost my entire educational career, plus a lot of fractions-related stuff (so, so very many people are terrible at this, can't even do basic things, IME it's where an awful lot of people permanently fall off the math-train, way back in like 3rd grade), basic arithmetic, and pre-algebra-tier simple variable substitution.
Every now and then I get a bug up my ass to try to expand my math abilities, but 1) I'm so goddamn rusty at this point because I never use any of it that I have to start back at brushing up on high school stuff, which is discouraging, and 2) I'm not even really sure what I'm going to do with it (long experience suggests: nothing) so the motivation fades fast.
