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5 1/2 is 11/2 as an improper fraction
5 as a fraction can be written as 10/2 or 5/1 which is an improper fraction.
A half as a fraction is 1/2. There are 4 half units in two whole units = 4/2 so 4/2 +1/2 = 5/2 5/2 is the improper fraction.
Not every fraction can be written as an improper one. Every improper fraction is greater than ' 1 '. Sadly, 2/5 is less than ' 1 ', so there's nothing you can do to it that can magically turn it into an improper one.
2 and 1/2 as an improper fraction is 5/2