When you make the fraction: 21 over 1 it is equal to the whole # 21
11 / 21 = 0.523809524
32/21
21/33
21
Expressed as a vulgar fraction in its simplest terms, by dividing both the numerator and denominator by 3, 12/21 is equal to 4/7, or four sevenths.
4/7
4/7
No.
5/9 + 7/12 20/36 + 21/36 41/36 = 1 5/36
7/12
7/12