No
3 goes into both
12/15 = 3x4/3x5 = 4/5
16/21 is already in its simplest form as a fraction
It is already in its simplest form as a fraction.
7 over 10 is already a fraction in simplest form.
The fraction 21/24 is already in its simplest form.
11/9 is already in its simplest form as a fraction
477/1000. This fraction is already in its simplest form.
8/21 is already in simplest form.
It is already in its simplest form as 55/36
4/9 is already in its simplest form as a fraction
This fraction is already in simple form.
Since the denominator of the fraction 8/13 is prime, the fraction is already expressed in its simplest form.
Since the denominator of the fraction is prime, the proper fraction 10/43 is already expressed in its simplest form.