4/9 is already in its simplest form as a fraction
If you mean: 8 over (9*4) then it is 2/9 in its simplest form
It is already in simplest form.
9/4 is in its simplest form.
4/9
It is 16/9.
4/9
0.44444444444 (repeated) or 4/9 The simplest form of that is 0.4 which is 44/99 or 4/9
3/4 times 4/9 = 12/36 = 1/3 in its simplest form
1/9
2 over 9
4 over 9