3/7
Nine over 21 in its simplest form is 3/7
21/25 is already in simplest form.
4/21
6/21 = 2/7 in simplest form
Yes, to 6/7
Common factor is seven. So it is 3 over nine
13/21 can't be reduced.
21/40 cannot be reduced.
You can divide both by 3. 18/ 21 = 6/7 6/7 is your answer.
25/21 is already reduced to its lowest terms
Reduced to its most simplified form, 21 over 12 (or 7/4) is "one and three-quarters" 13/4
The fraction 19/21 cannot be reduced any more.