To convert any improper fraction to a mixed number:
For 54/21 this becomes:
54 ÷ 21 = 2 r 12
⇒ 54/21 = 212/21
Fractions are usually stated in the simplest terms (that is no common factor between the numerator and denominator), so if your 54/21 had been the result of say an addition of fractions, it should be simplified:
54/21 = 18/7
= 24/7
54/21 = 212/21
= 24/7
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The mixed number for 21 over 8 is 25/8
21 over 20 as a mixed number = 11/20
You can't. That is a proper fraction. You can only turn improper fractions into mixed numbers
225% as a mixed number is 21/4
5 over 2 as a mixed number is 21/2