In this case, he cannot remember items in a series or the sequence of steps in a procedure. For example, he may have difficulty sequencing numbers, or performing the steps in long division or subtraction of fractions. The problem is compounded when the student does not understand the underlying concepts. Sometimes this problem is related to poorly developed logical thinking processes. Such lack of understanding causes students to resort to rote learning of isolated bits of information.
Understanding promotes learning in many ways.
It makes students more confident. It makes remembering easier. It helps students solve new kinds of problems. We are all better off when we understand how and why things work. Lack the prerequisite skills for a new task Many mathematical skills are composed of a collection of other skills.