You can't. That is a proper fraction. You can only turn improper fractions into mixed numbers
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21 over 20 as a mixed number = 11/20
The mixed number for 21 over 8 is 25/8
225% as a mixed number is 21/4
5 over 2 as a mixed number is 21/2
The mixed number for 21/4 is 5 1/4.