Math vs. maths
Math and maths are equally acceptable abbreviations of mathematics. The only difference is that math is preferred in the U.S. and Canada, and maths is preferred in the U.K., Australia, and most other English-speaking areas of the world.
Neither abbreviation is correct or incorrect. You may hear arguments for one being superior to the other, and there are logical cases for both sides. One could argue maths is better becausemathematics ends in s, and one could arguemath is better because mathematics is just amass noun that happens to end in s. In any case, English usage is rarely guided by logic, and these usage idiosyncrasies are often arbitrary. If you were raised in a part of the world where people say maths, then maths is correct for you, and the same is of course true of math. Don’t listen to anyone who says otherwise.
http://grammarist.com/spelling/math-maths/