I've always been good at math.  Well, at least for as long as I can remember.   When I was 8 or 10 years old, this meant that I could quickly add numbers together.  When I got to my pre-teens, it meant that I could quickly multiply numbers together.  I still have these skills.  I pretty much take them for granted and admittedly sometimes am amazed that most everyone else can't do the same.  I don't expect everyone to be able to multiply two 2-digit numbers together, but the numbers of times I'll hear someone ask something like what's 500 divided by 25 and not be able to do the math in a split-second is mind boggling to me.