I also find the term "maths" a bit odd, but that's just because it's not how things are said around here. I don't think it's due to an assumption of a plural where none exists, for I think we can and do distinguish between different types of mathematics. And to illustrate my first point, I spell it out in the second.

BTW, I really dislike it when people refer to citizens of the US (or anyone who might consider themselves a type of american) as "'merkin" as it resembles another word of the same spelling. Is it based on the thought that people from my land are fake and whorish?

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"What you think you thought you saw you did not see." Agent J, MiB - Manhatten Bureau