1) 16/63+12/63 = 28/63 = 4/92) 53/85-19/85 = 34/853) 8 34/81+2 38/81 = 11 6/81 = 11 2/274) 3 49/56-3 17/56 = -1 32/56 = -1 2/7
1) 16/63+12/63 = 28/63 = 4/9
2) 53/85-19/85 = 34/85
3) 8 34/81+2 38/81 = 11 6/81 = 11 2/27
4) 3 49/56-3 17/56 = -1 32/56 = -1 2/7