4/3, 7/5, 3/7, 3
21/5 is the simplest form.
Since the numbers 21 and 1600 share no common positive integer factors other than 1, the proper fraction 21/1600 is already expressed in its simplest form.
21/10 is in its simplest form.
4/21 is in its simplest form.
21/16 is in its simplest form.
Since the numbers 20 and 21 share no common positive integer factors, 20/21 is expressed in its simplest form.
21/80 is already in its simplest form
21/5 is the simplest form.
Since the numbers 21 and 1600 share no common positive integer factors other than 1, the proper fraction 21/1600 is already expressed in its simplest form.
21/10 is in its simplest form.
10/21 is in its simplest form.
440/21 is in its simplest form.
21/16 is in its simplest form.
4/21 is in its simplest form.
21/52 is the simplest form.
21/100 is in its simplest form.
21/46 is the simplest form.