To convert an improper fraction to a mixed number, divide the denominator into the numerator. The answer is the whole number. Put any remainder over the original denominator to create the fraction part.
21/4 = 5 and 1/4
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It is 5 and 1/4.
21 over 20 as a mixed number = 11/20
The mixed number for 21 over 8 is 25/8
The mixed number for 21/4 is 5 1/4.
225% as a mixed number is 21/4