3/9 + 5/54 = 18/54 + 5/54 = 23/54
6/36 + 2/6 = 1/6 + 2/6 = 3/6 = 1/2
4/6 + 1/4 = 8/12 + 3/12 = 11/12
7/8 + 2/9 = 63/72 + 16/72 = 79/72
9/81 + 6/9 = 1/9 + 6/9 = 7/9
4/12 + 8/2 = 2/6 + 24/6 = 26/6 = 13/3
3/9 + 5/54 = 18/54 + 5/54 = 23/54
6/36 + 2/6 = 1/6 + 2/6 = 3/6 = 1/2
4/6 + 1/4 = 8/12 + 3/12 = 11/12
7/8 + 2/9 = 63/72 + 16/72 = 79/72
9/81 + 6/9 = 1/9 + 6/9 = 7/9
4/12 + 8/2 = 2/6 + 24/6 = 26/6 = 13/3