Throughout school, I was absolutely HOPELESS. I couldn't do anything when it came to basic math, except some algebra. These questions (even faced with the formula to solve it) still bugger my head. I tried to read books, get tutors, do everything to better myself (who ever heard of a computer guy who couldn't do math!).
I can easily write algorithms, do algebra, write complex programs, do anything on a computer but faced with a question like this my brain shuts down very quickly.
I stumbled across this one day... still not sure if I believe it's a thing... and that I have it: http://en.wikipedia.org/wiki/Dyscalculia