1. 6 - 2 10/13 2. 7 3/8 + 1 7/10 3. 4 11/12 + 5 13/18 4.9 2/9 - 6 5/6

1. 6 - 2 10/13=5 1/3-2 10/13= 4 14/13 - 2 10/13 =2 4/13

2  7 3/8 + 1 7/10= 7 15/40+1 28/40=8 43/40 =9 3/40

 3. 4 11/12 + 5 13/18=4 33/36+ 5 26/36=9 59/36= 10 23/36

4.9 2/9 - 6 5/6=  9 4/18-6 15/18=8 22/18-6 15/18=2 7/18