21/10 is in its simplest form.
10/21 is the simplest form.
10/21
21/10 is already in simplest form as a fraction. As a mixed number it is 21/10
10/21 is its simplest form.
10/21 is in its simplest form.
7/10
10/21
7/10
10/7
21/2
42/20 = 21/10 = 21/10