21 over 4 does not equate to a whole number.
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7 over 4 does not equate to a whole number.
The mixed number for 21/4 is 5 1/4.
21/4
When you divide 20 by 5, you get 4 as the quotient. Therefore, 20 over 5 as a whole number is 4. In fraction form, it is written as 4/1, but as a whole number, it is simply 4.
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