And on the other side... 4 X (-18) ... well let's see that's 40... well, let's just write it out. ... so 18 X 4 ... if we were to multiply 18 X 4 ... 4 X 8 = 32, 4 X 1 = 4, plus 1 is 72 -- but this is (-18) X 4, so it's (-72).