If it features the denominator 4, and its related to 1/2, then what you would have to do is figure out how to turn the denominator 2, to 4. which 2 x 2 is four so you do the same thing to the numerator. Since the numerator is one, then you multiply 1 and 2 then you get 2. Combine them into a fraction and you get 2/4.
