I would say that "math" is an Americanism more than "maths" is a Britishism, given the greater overall useage of the later.

__________________
I offer a complete and utter retraction. The imputation was totally without basis in fact, was in no way fair comment and was motivated purely by malice. I deeply regret any distress that my comments may have caused you or your family, and I hereby undertake not to repeat any such slander at any time in the future.