4/90=4/(45*2)=2/45
8/88=8/(8*11)=1/11
2/100=2/(50*2)=1/50
18/20=(9*2)/(2*10)=9/10
90/120=(30*3)/(30*4)=3/4
7/63=7/(7*9)=1/9
8/56=8/(8*7)=1/7
24/96=24/(24*4)=1/4
2/8=2/(4*2)=1/4
6/72=6/(6*12)=1/12
39/91=(3*13)/(13*7)=3/7
5/55=5/(5*11)=1/11
4/90=4/(45*2)=2/45
8/88=8/(8*11)=1/11
2/100=2/(50*2)=1/50
18/20=(9*2)/(2*10)=9/10
90/120=(30*3)/(30*4)=3/4
7/63=7/(7*9)=1/9
8/56=8/(8*7)=1/7
24/96=24/(24*4)=1/4
2/8=2/(4*2)=1/4
6/72=6/(6*12)=1/12
39/91=(3*13)/(13*7)=3/7
5/55=5/(5*11)=1/11