Top Answer

4 over 21 is already in simplest form. The only factors of 4 are 1, 2, and 4; the only factors of 21 are 1, 3, 7, and 21. Since the only common factor is 1, we cannot simplify the fraction further.

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4/21 is in its simplest form.

12/21 = 4/7 in its simplest form.

4/21 is already in its simplest form.

21/4 is in its simplest form.

21/16 is in its simplest form.

4 over 21

12/21 = 4/7

4/21

4/7

3/4

21/4

4/21

4/21

21/4

7/4

12/21 = 4/7 in its simplest form

21/4 or 5¼

1/4, .25.

3/4

4/3

4/21

No. 16/84 = 4/21

63/28 = 9/4 or 21/4

3 and 3/4 or 15/4

1 and 12 21sts * * * * * But in its simplest form it is 11/7 or 1 4/7