1 2/7 × 2 3/5 × 2 1/4 : 5 2/5 × 1 6/7 × 1/4
1) 1 2/7 × 2 3/5 = 9/7 × 13/5 = 117/35 = 3 12/35
2) 3 12/35 × 2 1/4 = 117/36 × 9/4 = 117/4 × 1/4 = 117/16 = 7 5/16
3) 7 5/16 : 5 2/5 = 117/16 : 27/5 = 117/16 × 5/27 = 1 17/48
4) 1 17/48 × 1 6/7 = 65/48 × 13/7 = 2 173/336
5) 2 173/336 × 1/4 = 845/1344.