3/15 + 4/5
15/15 or 1
2/3 - 1/9
5/9
14/20 - 3/5
2/20 or 1/10
3/15 + 1/3
8/15
1/2 + 1/18
10/18 or 5/9
1 10/15 + 2 4/5
3 22/15 or 4 7/15
1/4 + 2/8
4/8 or 1/4
2/7 + 3/14
7/14 or 1/7
4/6 + 2/3
8/6 or 4/3 or 1 and 1/3
6/12 + 1/5
42/60 or 21/30
5/10 + 1/2
10/10 or 1
2 6/10 + 3 1/2
5 11/10 or 6 1/10
2 2/12 + 1 2/4
3 8/12 or 3 2/3
1/2 - 3/16
5/16
2/9 + 3/6
13/9
3 2/9 - 1 4/6
1 10/18 or 1 5/9
1 2/25 + 1 3/5
2 17/25
4/6 + 1/18
13/18
5/6 - 3/5
7/30
1 1/7 + 1 1/2
2 9/14
2 1/3 - 1 2/7
1 1/21