Math(s)

[Momiji]

First, why add the 's' at the end of the word? Shouldn't a subject in general be singular?

Different types of math, grasshopper. When's the last time you heard anyone tell you that Calculus is the same as Algebra?

They aren't the same. However, they all fall under the general subject of math.

For example, Chemistry and Biology are both types of science, but you don't call the subject they fall under 'sciences', do you?