21/40 is less than 1 and so it can't be expressed as a mixed number
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62/21 will not reduce. they have no common factor except 1. You an convert it into a mixed number by dividing.
The mixed number for 21 over 8 is 25/8
21 over 20 as a mixed number = 11/20
5 over 2 as a mixed number is 21/2
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