12 / 18 X 5 / 10 =
12 / 20 X 5 / 15 =
3/8 X 6/6 =
2 / 5 X 5/7 =
4 / 7 X 3 / 5 =
1/5 X 2/4 =
5 / 6 X 11/ 12 =
6 / 7 X 2 / 4 =
14 / 8 X 2 / 4 =
4 / 6 X 3 / 9 =
1/10
3 / 7
3/8
7 / 8
2/7
12 / 35
55/72
2/9
1 / 5
1 / 3
