8 9/20 * 2/13=169/20 * 2/13=13/10=1 3/10
5 1/3 * 3/8=16/3 * 3/8=2
10 1/2 * 2/7=21/2 * 2/7=3
5/6 * 1 6/5=5/6 * 11/5=11/6=1 5/6
3 1/9 * 3/8=28/9 * 3/8=14/12=7/6=1 1/6
9 1/7 * 3/4=64/7 * 3/4=48/7=6 6/7
10 1/5 * 10/17=51/5 * 10/17=3*2=6
3/11 * 5 1/2=3/11 * 11/2=3/2=1 1/2