Definition of mathes:
(n) :
(informal, uncountable, Canada, US, Philippines) Arithmetic calculations; (see do the math).
(n) :
(informal, countable, Canada, US, Philippines) A math course or class.
(v) :
(colloquial, informal) To perform mathematical calculations or mathematical analysis; to do math
(v) :
(slang) To add up, compute; (by extension) to make sense.
(n) :
A mowing; what is gathered from mowing.
(n) :
(informal, uncountable, Canada, US, Philippines) Clipping of mathematics. [An abstract representational system studying numbers, shapes, structures, quantitative change and relationships between them.]