1 x 9 = 9
2 x 9 = 18 -> 1 + 8 = 9
3 x 9 = 27 -> 2 + 7 = 9
4 x 9 = 36 -> 3 + 6 = 9
5 x 9 = 45 -> 4 + 5 = 9
6 x 9 = 54 -> 5 + 4 = 9
7 x 9 = 63 -> 6 + 3 = 9
8 x 9 = 72 -> 7 + 2 = 9
9 x 9 = 81 -> 8 + 1 = 9
10 x 9 = 90 -> 9 + 0 = 9
11 x 9 = 99 -> 9 + 9 = 18 -> 1 + 8 = 9
12 x 9 = 108 -> 1 + 0 + 8 = 9
13 x 9 = 117 -> 1 + 1 + 7 = 9
263 x 9 = 2367 -> 2 + 3 + 6 +7 = 18 -> 1 + 8 = 9
7 + 7 + 1 + 9 + 8 + 4 = 36 -> 3 + 6 = 9
