You cannot.
4/16 = 1/4
To 1/4
1/13
in lowest terms 1 over 1.25
4/12 = 2/6 = 1/3
8/4 = 2/1 = 2
4/8 = 2/4 = 1/2
They are the same - both reduce to ½ (one over two)
its 2 over 4 because when u reduce 2 over 4 u get 1 over 2
2 and 4 can cross reduce each other making it 1*1 over 1*2 so it would be 1 over 2 or one half
4/12 = 2/6 = 1/3
25/4 cannot be reduced as 25 and 4 have no common factor besides 1.