According to this article, mathematical ability is made not born.
Thats what they say in their conclusion anyway. I think its a bit ridiculous to generalise from their specific case and what exactly they were doing (which is probably just hyped up arithmetic). Still might be worthwhile though. Basically, this guy can calculate calender dates far in advance (i guess a little like the dude from rainman). They done some tests and found out he didn't have some kind of special ability or was born like that, it was more likely due to an unusual amount of time and effort invested in it.
I think i'd disagree purely based on observation. Some people just aren't good at math, likewise, some people are very good at math. I know i'm absolutely terrible but then again i didn't try very hard either. I think this raises interesting questions about how it should be taught and streamed in the curriculum.