They add up to 21/22
21/22
-21/14 + -1/14 = -22/14 or -1 and 4/7
15/42 + 7/42 = 22/42 = 11/21
4/14 or 2/7
3/14 + 1/3 = 0.5476
1/7 + 1/14 = 3/14= 1/7 + 1/14= 2/14 + 1/14= 3/14
1/2+5/11 =(the common denominator is 22) 11/22+10/22=22/22=1
14/45
5/14 + 1/6 equals 0.52380952381.
14/21 + 1/7 = 17/21
1/2 + 1/7 = 7/14 + 2/14 = 9/14
0.357142857