math (n.1)

American English shortening of mathematics, 1890; the British preference, maths, is attested from 1911.

math (n.2)

"a mowing," Old English mæð "mowing, cutting of grass," from Proto-Germanic *mediz (source also of Old Frisian meth, Old High German mad, German Mahd "mowing, hay crop"), from PIE root *me- (4) "to cut down grass or grain."