Simplest would imply the one that is the most simple, so there is only 1 simplest form.
21 = 3 * 7 ; 28 = 4 * 7
3 * 7
------- = 3/4
4 * 7
6/63 = 2/21
21/80 is already in its simplest form
The simplest form of 21 over 42 is 21/42 = 1/2
21/5 is the simplest form.
Expressed as a mixed number in its simplest form, 27/21 is equal to 1 3/7 or one and three sevenths.
Nine over 21 in its simplest form is 3/7
14 over 21 or 14/21 in simplest form is 2/3 or 2 over 3
The simplest form of 105 over 441 is 5 over 21.
21/50 is in its simplest form.
Expressed as a proper fraction in its simplest form, by dividing the numerator and denominator by 7, 21/49 is equal to 3/7 or three sevenths.
21/46 is the simplest form.
21/52 is the simplest form.