3 1/2+1/2=3 2/2=4
4 1/3+1 2/3=4+1+1/3+2/3=5+3/3=6
2 3/8+3 5/8=2+3+3/8+5/8=5+8/8=6
3 2/3+1 2/3=3+1+2/3+2/3=4+4/3=5 1/3
5/7+5 4/7=5+9/7=6 2/7
5 2/9+2 1/9=5+2+2/9+1/9=7 3/9=7 1/3
3/8+2 1/4=3/8+2 2/8=2 5/8
1/4+3 1/6=3/12+3 2/12=3 5/12
5 2/15+3 2/9=5+3+2/15+2/9=8+6/45+10/45=8 16/45
2 4/9+1/6=2 8/18+3/18=2 11/18
1 3/6+10 1/4=1 1/2+10 1/4=11+2/4+1/4=11 3/4
4 1/4+2/9=4+9/36+8/36=4 17/36