I'm not good at math, but that won't stop me from taking a stab at it: 5 x (-3) = 5 x (-1)3 = -1(3+3+3+3+3) = -1(15) = -15 (-5) x (-3) = -1(5) x -1(3) = -1 x -1(3+3+3+3+3) = -1 x -1(15) = 1(15) =15 Yeah, what Chuck says above looks right. -- jazzmuzik