Well first of all, you have to look for improper fractions. That would be the greatest. Now, for the proper fraction, you could compare them by cross-multiplying wherein, you will multiply the numerator 1 to the denominator 2. That meant like this:
5/6[cross]1/2 means that both sides will result to this: 10,6;meaning,5/6 is greater than 1/2.