1/2
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0.5
The Fraction 2 over 5 is 2/5 or 1/10
To unsimplify a fraction, multiply the numerator and denominator by the same unit - it doesn't even necessarily have to be an integer unit. For example, an unsimplified version of 5/7 could be (5 x 2) = 10 over (7 x 2) = 14 - or 10/14.
10 over 26
The fraction halfway between 2/5 and 9/10 is 13/20