Fractions cause such confusion for many students. While students are young, i.e., third grade or so, they need to be able to understand the fundamentals of fractions. So often teachers emphasize procedures at the expense of understanding relationships among numbers, which is vitally imporant in higher level math. Children need to understand that the numerator is telling how many things there are and the denominator is describing the size of the piece. Once that fundamental concept is grasped, then they will be doing much better. Read how several different contributors have dealt with this fraction problems.
Federal Research Suggests New Approach to Teaching Fractions. Sarah Sparks. 7.18.13. Education Week - Premium Article