So in US English we shorten mathematics to math, and in the UK they say maths. Where does the 'S' come from in the UK version? For some reason I had it in my head that this was just because it's plural so you add the 's'; referring to multiple types of mathematics. But a question on another SE site just made me think about it, and it's actually not. "Mathematics" is both plural and singular:
I am studying mathematics in school.
There are many different types of mathematics.
So the 's' isn't a marker of a plural, so my mental-reasoning for why Brits use the 's' in maths is wrong.
The question becomes then, why is it there? I can't think of another abbreviation that pulls a letter from the end of the word like that ("math*******" vs "math*******s"). And this isn't just an extension of something used for similar words, because I don't think other subjects are abbreviated this way. So what is the reasoning behind it/where did it come from? Is it just what people started saying? Did a prominent person start using it? Did other people think (not very hard about it!) like I used to and jump to the plural conclusion? Or does it stand for something else?
To elaborate on my point about "not just adding the S for similar words", I'll take an example from a comment: "economics". In the US we shorten this to "econ". But I don't think they say "econs" in the UK, do they? So why just "maths"?
Best Answer
Abbreviations and contractions of words follow many conventions, take for example the word continued I have seen it abbreviated/shortened/contracted or clipped in three ways.
Mathematics can be similarly contracted
Perhaps, originally, the written form with the apostrophe, math's, was more common in Great Britain but over time the apostrophe became obsolete. In fact the apostrophe in math's has no effect on its pronunciation. Unfortunately, I don't have access to the Oxford English Dictionary to confirm my suspicion that the term math's was ever used. The Online Etymology Dictionary instead states that the American math first appeared in 1890 while the British maths is attested from 1911.
Wikipedia has this to say on contractions:
Further on, Wikipedia explains
Curious to see whether I could find the apostrophe version, I turned to Google Books and found to my surprise that math's existed in the US, this example is dated 1836, and predates Word Detective's claim that the first instance of math appeared in 1847.
Larry Trask who was professor of Linguistics in Sussex University (UK) mentions the most common shortened forms where the apostrophe still survives.
EDIT
Published in Richmond USA by William F. Richie, 1853-54, The Merit Roll of the Cadets of the Virginia Military Institute, July 1853 lists math's as the shortened form for mathematics twice!
Personal Reflections
As demonstrated in the excerpts I provided, it seems clear that the spelling convention for contracted words i.e., the use of the apostrophe for showing the omission of letters, was also used in the US. The shortened form math's was necessary in order to save space but for some reason the superfluous apostrophe and the letter -S were kept despite logic demanding that the word math was shorter. The question also arises whether this contracted word was ever actually spoken by Americans? My guess? Probably not, they chose not to say maths /maθs/ because it sounded plural and therefore opted for the clipped form, math /maθ/ in speech. The British, being renowned traditionalists, decided to keep the "silent" apostrophe in speech and thus favoured the longer form maths.