5)3 21/25 + 1 2/5 = 96/25 + 7/5 = (96 × 1 + 7 × 5)/25 = 96/25 + 35/25 = 131/25 = 5 6/25
6)4 3/16 - 2 3/8 = 67/16 - 19/8 = (67 × 1 - 19 × 2)/16 = 67/16 - 38/16 = 29/16 = 1 13/16
7)5 5/6 - 31/48 = 35/6 - 31/48 = (35 × 8 - 31 × 1)/48 = 280/48 - 31/48 = 249/48 = 83/16 = 5 3/16
8)6 4/7 - 2 37/77 = 46/7 - 191/77 =(46 × 11 - 191 × 1)/77 = 506/77 - 191/77 = 315/77 = 45/11 = 4 1/11