Maths vs Math

I believe it is math instead of math's. The idea behind math's is you need to put a 's' at the end of it because, it is the end of a word. But that doesn't seem to be the case to me at all. When I am referring to Miscellaneous I do not writs Miscs. I write Misc. Or according to Abbriveations.com if I am abbreviating 2-Meter wavelength I just write 2mtr which is doesn't have an h at the end of it.

But, what do you believe why would I use maths instead?

Mathematics is the full word. However, there are different ways to say it. Americans say math, British say maths. Just go with whatever sounds better for you.

Neither are incorrect. It depends on your dialect.

Maybe.