Two wholes and a quarter. (assuming you mean 9/4.)
The fraction one-fourth is already in simplest form.
No, nine twelfths in its simplest form is three fourths.
3/4 is the simplest form.
1/4 is in its simplest form.
Nine over 21 in its simplest form is 3/7
It is already in its simplest form.
9/11 is in its simplest form.
9/8 is in its simplest form.
9/14 is in its simplest form.
9/20 is in its simplest form.
9/10 is the simplest form.
89/6 is in its simplest form.