2/4 + 1/4
5/10 + 3/10
2/3 + 1/3
4/5 + 2/5
3/4 + 2/4
9/12 + 3/12
1/8 + 3/8
2/8 + 6/8
1/3 + 1/3
6/5
5/4
12/12
8/8
8/10
3/4
4/8
2/3
3/3
