5 3/4 + 2 1/6 = 23/4 + 13/6 = (23 × 3 + 13 × 2)/12 = 69/12 + 26/12 = 95/12 = 7 11/12
4 5/9 - 2 1/27 = 41/9 - 55/27 = (41 × 3 - 55 × 1)/27 = 123/27 - 55/27 = 68/27 = 2 14/27
7 3/5 - 2 1/8 = 38/5 - 17/8 =(38 × 8 - 17 × 5)/40 = 304/40 - 85/40 = 219/40 = 5 19/40
8 3/8 + 2 1/5 = 67/8 + 11/5 =(67 × 5 + 11 × 8)/40 = 335/40 + 88/40 = 423/40 = 10 23/40
4 3/7 + 2 1/4 = 31/7 + 9/4 =(31 × 4 + 9 × 7)/28 = 124/28 + 63/28 = 187/28 = 6 19/28