1. 2/8=1/4
2. 5/7=15/21
3. 4/5=8/10
4. 1/5=5/25
5. 2/11=4/22
6. 3/4=18/24
7. 2/7=4/14
8. 5/5=40/40
9. 9/15=3/5
10. 5/9=10/18
11. 36/40=9/10
12. 7/9=49/63
13. 8/9=24/27
14. 21/27=7/9
15. 2/7=12/42
16. 64/72=8/9