I have an unaspected Mercury and I've always enjoyed Maths, and I also taught it for many years.
My older brother however, makes me look like a mathematical dunce. He has taught it at university level and has taught gifted kids in maths, something I couldn't manage. He has Mercury trine Saturn, where Mercury rules his 9th house and is intercepted (i,e, Virgo is) in his 12th, while Saturn rules his 4th house. He is very mathematical in his speech........like, when giving options, he'll say something like: "a) we can go to the beach, or b) we can have a barbeque at the park, or c) we can stay home." True story - that's how he talks, just like a multiple choice test.
EDIT: British physicist, Stephen Hawking (and the basis of any physics is mathematics) has his Cap Mercury trining his Saturn-Uranus conjunction in Taurus. The Uranus factor suggests the inventiveness of his work.