21 x 0 = 0 21 x 1 = 21 21 x 2 = 42 21 x 3 = 63 21 x 4 = 84 21 x 5 = 105 21 x 6 = 126 21 x 7 = 147 21 x 8 = 168 21 x 9 = 189 ?

21 x 0 = 0 21 x 1 = 21 21 x 2 = 42 21 x 3 = 63 21 x 4 = 84 21 x 5 = 105 21 x 6 = 126 21 x 7 = 147 21 x 8 = 168 21 x 9 = 189 !