Ok, bear with me...
I've always felt the expression "to times something by x" sounds completely wrong and that it should in fact be "multiply by x". I hate the word "timesing" even more.
I suspect that, etymologically, "five times three" originally meant "three, five times" (i.e. "times" was a plural noun). Obviously it's generally accepted as a verb these days, but perhaps not in more formal writing.
AIBU?