2/5+3/10=4+3/10=7/10
2/9+2/3=2+6/9=8/9
3/4+5/8=6+5/8=11/8=1 3/8
7/8+1/2=7+4/8=11/8=1 3/8
1/2+1/4=2+1/4=3/4
3/10+2/5=3+4/10=7/10
1/6+2/3=1+4/6=5/6
3/5+1/20=12+1/20=13/20
2/5+3/10=4+3/10=7/10
2/9+2/3=2+6/9=8/9
3/4+5/8=6+5/8=11/8=1 3/8
7/8+1/2=7+4/8=11/8=1 3/8
1/2+1/4=2+1/4=3/4
3/10+2/5=3+4/10=7/10
1/6+2/3=1+4/6=5/6
3/5+1/20=12+1/20=13/20