Without using a calculator or algebra discs, find the value of each of the following.

(a) 2x (-6) (d) -3x(-7) (g) 15 x (-2) (j) -2(-100) (b) -5x4 (e)-(-10) (h) -3x 12 (c) -1 x (-8) (f)-9(-2) (i) -4x (-10)