Reduced to its most simplified form, 21 over 12 (or 7/4) is "one and three-quarters" 13/4
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When you make the fraction: 21 over 1 it is equal to the whole # 21
11 / 21 = 0.523809524
21/33
32/21
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.