19 = (1 + 9 = 10; 1 x 9 = 9) ==> 10 + 9 = 19
29 = (2 + 9 = 11; 2 x 9 = 18) ==> 11 + 18 = 29
39 = (3 + 9 = 12; 3 x 9 = 27) ==> 12 + 27 = 39
49 = (4 + 9 = 13; 4 x 9 = 36) ==> 13 + 36 = 49
59 = (5 + 9 = 14; 5 x 9 = 45) ==> 14 + 45 = 59
69 = (6 + 9 = 15; 6 x 9 = 54) ==> 15 + 54 = 69
79 = (7 + 9 = 16; 7 x 9 = 63) ==> 16 + 63 = 79
89 = (8 + 9 = 17; 8 x 9 = 72) ==> 17 + 72 = 89
99 = (9 + 9 = 19; 9 x 9 = 81) ==> 18 + 81 = 99
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