Reduce the following fraction to the lowest terms.

1. 2/4 =
2. 3/6 =
3. 5/15 =
4. 12/20 =
5. 15/20 =
6. 10/50 =
7. 12/24 =
8. 35/50
9. 75/100 =
10. 21/49 =​