1) 3/23*4=12/23
30*7/40=210/40=21/4=5 1/4
2/17*8=16/17
7*4/31=28/31
2/15*2=4/15
3*1/14=3/14
5/43*5=25/43
8*4/31=32/31=1 1/31
2) 2/45*15=30/45=2/3
14*1/42=14/42=2/6=1/3
5/81*9=45/81=5/9
6*5/36=30/36=5/6
14*3/56=42/56=3/4
3/64*12=36/64=9/16
6*7/72=42/72=7/12
3/55*11=33/55=3/5
3) 15/17:3=5/17
16/17:3=16/51
22/23:7=22/161
20/23:7=20/161
16/25:4=4/25
17/25:4=17/100=0.17
21/23:7=3/23
35/41:5=7/41
34/41:5=34/205