1. 2/6:2=1/3 3/9:3=1/3 4/12:4=1/3 5/25:5=1/5 6/48:6=1/8 10/90:10=1/9
2. 6/14:2=3/7 10/22:2=5/11 12/14:2=6/7 14/16:2=7/8 18/28:2=9/14 20/26:2=10/13
3. 6/9:3=2/3 12/15:3=4/5 18/21:3=6/7 30/33:3=10/11 24/27:3=8/9 36/39:3=12/13
4. 5/15:5=1/3 10/35:5=2/7 6/18:6=1/3 14/49:7=2/7 16/40:4=4/10 100/200:100=1/2