18 x 1 = 18
18 x 2 = 36
18 x 3 = 54
18 x 4 = 72
18 x 5 = 90
18 x 6 = 108
18 x 7 = 126
18 x 8 = 144
18 x 9 = 162
18 x 10 = 180
18 x 11 = 198
18 x 12 = 216
18 x 13 = 234
18 x 14 = 252
18 x 15 = 270
18 x 16 = 288
18 x 17 = 306
18 x 18 = 324
18 x 19 = 342