1) (6+2)+(5/13+8/13) = 8+13/13 =8+1=9
2)(5+3)+(4/7+6/7) = 8+10/7 = 8+1 3/7 = 9 3/7
3) 19/19-15/19 = 4/19
4) 7 9/9 - 3 4/9 = (7-3)+(9/9-4/9) = 4+ 5/9 = 4 5/9
5)6 11/8 - 2 5/8 = (6-2)+(11/8-5/8) = 4+ 6/8 = 4 6/8 =4 3/4
6) 13 47/32 - 9 19/32 = (13-9) + (47/32-19/32) = 4 + 28/32 = 4 28/32 =
= 4 7/8
7)9 4/3 - 2 2/3 = (9-2)+(4/3-2/3)= 7+2/3 =7 2/3