Adding
2/4 + 1/4
3/4
3/4-1/4
2/4
1/2 x 2/3
2/6
1/2 / 1/2
2/2
2 x 3
6
3/5 + 2/5
5/5
4/5-3/5
1/5
6/4
2/3 / 1/2
4/3
4 x 3
12
4/8 + 2/8
6/8
6/10-4/10
2/10
2/5 x 2/2
4/10
3/4 / 2/3
9/8
5 x 4
20
12/17
10/12-4/12
6/12
4/10 x 2/3
8/30
3/4 / 1/5
15/4
10 / 2
5
3/12 + 2/12 + 4/12
9/12
10/15 - 2/15 - 1/15
7/15
2/3 x 2/2 x 1/2
5/10 / 3/4
20/30
20/5
4