"Math" is a generic term over here, covering all flavors of the art. If we wish to speak of specifics, we generally go with Geometry, Trigonometry, Analysis, Fractals, Field Theory, etc, rather than using the plural "Maths".
I don't really think it makes more sense; it's just what we're used to seeing over here. We really are two cultures separated by a common language, aren't we?
