What is the singular of...

As I was reading this BBC story, "How to solve the British maths problem?"[1] I was reminded of my numerous British friends and colleagues always ribbing me (a United States citizen) how bad my English was. That was, of course, in the context of their British English since I think my American English is at least in the top quartile in terms of correctness[2].

As I read the story I was left with one question. In the UK, how much, or big, or many, is one "math"?







[1]http://news.bbc.co.uk/2/hi/uk_news/magazine/7435023.stm
[2] Yes, I fully expect to have errors in this post pointed out. Thanks.