reducing
63/81
7/9
1/4 = ?/28
7
12/24
1/2
1/2 * 2/3
1/3
3/5 * 4/9
4/15
12/45
4/15
2/9=?/27
6
18/42
3/7
5/8 * 1/10
1/16
7/8 * 4/5
7/10
9/21
3/7
6/7=?/42
36
56/72
7/9
1/4 * 1/4
1/16
3/3 * 4/4
1
28/42
2/3
8/9=?/72
64
35/40
7/8
4/9 * 6/7
8/21
1/5 * 0/9
0
56/64
7/8
7/9=?/54
42
36/48
3/4
4/7 * 1/2
2/7
9/10 * 2/3
3/5