1) 19 5/6 - 6 1/12 - 2 7/9 = 13 4/36 - 2 14/36 - 2 28/36 = 10 17/36
2) 11 7/10 - 5 7/30 - 3 4/15 = 10 28/30 - 5 7/30 - 3 2/15 = 6 19/30
3) 9 14/15 - 2 1/5 - 4 7/10 = 8 56/30 - 2 6/30 - 4 21/30 = 2 29/30
4) 20 3/8 - (6 - 2 1/6) = 20 3/8 - 6 + 2 1/6 = 20 3/8 - 6 + 2 6/8 = 16 3/8 + 2 6/8 = 18 7/8
5) 28 1/20 - (7 - 2 8/15) = 28 1/20 - 7 + 2 8/15 = 28 1/20 - 7 + 2 16/15 = 27 15/20 - 7 + 2 16/15 = 20 15/20 + 2 16/15 = 22 11/12
6) 29 3/25 - (4 - 2 1/5) = 29 3/25 - 4 + 2 1/5 = 29 3/25 - 4 + 2 5/25 = 29 3/25 - 4 + 2 5/25 = 25 8/25 + 2 5/25 = 28 13/25
1) 19 5/6 - 6 1/12 - 2 7/9 = 13 4/36 - 2 14/36 - 2 28/36 = 10 17/36
2) 11 7/10 - 5 7/30 - 3 4/15 = 10 28/30 - 5 7/30 - 3 2/15 = 6 19/30
3) 9 14/15 - 2 1/5 - 4 7/10 = 8 56/30 - 2 6/30 - 4 21/30 = 2 29/30
4) 20 3/8 - (6 - 2 1/6) = 20 3/8 - 6 + 2 1/6 = 20 3/8 - 6 + 2 6/8 = 16 3/8 + 2 6/8 = 18 7/8
5) 28 1/20 - (7 - 2 8/15) = 28 1/20 - 7 + 2 8/15 = 28 1/20 - 7 + 2 16/15 = 27 15/20 - 7 + 2 16/15 = 20 15/20 + 2 16/15 = 22 11/12
6) 29 3/25 - (4 - 2 1/5) = 29 3/25 - 4 + 2 1/5 = 29 3/25 - 4 + 2 5/25 = 29 3/25 - 4 + 2 5/25 = 25 8/25 + 2 5/25 = 28 13/25