4/7 is already in its simplest form
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2 3/4
Mixed number: 3 3/4 Incomplete fraction: 15/4 Or 3.75
2.75 as an improper fraction is 11/4 2.75 as a mixed number is 2 and 3/4
21 over 5 as a mixed fraction is 4 1/5.
Neither - 21/4 is a top-heavy fraction. It can, however, be expressed as a mixed number - it is equal to 5 1/4 or five and a quarter.