6/3 × 2/5 = 6 × 2/3 × 5 = 12/15 13/5 × 7/8 = 13 × 7/5 × 8 = 91/40 12/7 × 4/9 = 4/7 × 4/3 = 4 × 4/7 × 3 = 16/21 14/5 × 12/11 = 14 × 12/5 × 11 = 168/55 3/4 × 8/6 = 1/1 × 2/2 =1 × 1 = 1