If your referring to a Fraction which would be 5/7 and 2/7 the difference is 2/7 is not greater than 5/7 because to get the answer you convert each fraction into decimal numbers. We do this by diving the numerator by the seminar or for each fraction.
As you see here this is an example:
2/7=0.286
5/7=0.714
Then compare the two decimal numbers to get the answer. 0.286 is not greater than 0.714. Which means
2/7<5/7