1) 2/3 + (-10 1/3) = 2/3 - 31/3 = -29/3
2) -3/8 + 4/7 = -21/56 + 32/56 = 11/56
3) 3/5 + (-1 5/6) = 3/5 - 11/6 = -43/30
4) 2/9 + (-1 5/6) = 2/9 - 11/6 = -65/54
5) 4/5 + (-2/7) = 28/35 - 10/35 = 18/35
6) -9 + 2/9 = -81/9 + 2/9 = -79/9
1) 2/3 + (-10 1/3) = 2/3 - 31/3 = -29/3
2) -3/8 + 4/7 = -21/56 + 32/56 = 11/56
3) 3/5 + (-1 5/6) = 3/5 - 11/6 = -43/30
4) 2/9 + (-1 5/6) = 2/9 - 11/6 = -65/54
5) 4/5 + (-2/7) = 28/35 - 10/35 = 18/35
6) -9 + 2/9 = -81/9 + 2/9 = -79/9