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I'm not sure if that's a familiarity issue or an intuitiveness issue. I'd say I'm very good at math, but I'm also weakest at division mentally. I think part of it is we come across the other operations more frequently in life and our brains are more tuned for them, whether that be nature or nurture. I think the only way to change that is practice.
the question is where to start practising. i am absolutely terrible at most math; i can't balance an equation to save my life, i tend to get all my trig backwards, and the only thing i consistently get right for calculus is that odd-power exponentials are assymmetrical. despite that i struggled my way up to differential equations and found that annoyingly, combinatorics and boolean algebra came naturally.
you are describing my experience with math almost 1:1, it's uncanny... division is unintuitive, i've re-learned calculus from scratch like four times during my school career and none of the actual math made intuitive sense, trig never clicked. i've been doing computer graphics for like 6 years now and despite trig being everywhere i still need like 30 seconds to puzzle out what
sin(0)is for the thousandth time. but i aced combinatorics without even trying as soon as i heard that the funny fraction-looking thing with parentheses is called "n-choose-k", and if you give me a boolean expression with 5 levels of nested parenthesis and i can simplify it in my head in seconds.i know, right?! like, a friend of mine was doing a homebrew computer project a year or so ago and had issue with some complex instruction logic in the alu or whatever, and without having done it for over a decade i just sketched up a karnaugh map and struck two terms out. i even confused myself with that one.