Whenever a boy or girl with normal intellectual capacities presents/displays a specific difficulty in the process of learning of the mathematics lies down the fault to " difficulty that entails materia" or simply to that " they do not danbien nmeros" to him;. Nevertheless, like dislexia is an upheaval of the learning related to the denominated reading, few know that also an upheaval of the learning occurs that affects the yield of the capacities of arithmetic calculation: discalculia. A dysfunction that affect more to a percentage of the infantile population (between 3% and 6%) similar to known others like dislexia or the deficit of attention with hyperactivity (TDAH) and that, if it does not treat in time, can drag an important educative delay.Discalculia is a dysfunction that affects to the process of learning of the calculation in children with a normal intellectual quotient and that it is translated, in the case of the academic curriculum, in a low yield in mathematics. Clinically speaking, discalculia takes place by one smaller maturation at cerebral level of the areas related to the numerical processing. As it points Josep M. Serra Grabulosa, Doctor in Psychology of the Department of Psiquiatra and Clinical Psicobiologa of the University of Barcelona, the problem is based in which " the stimuli that occur in the school are not sufficient to finish maturing these cerebral regions, for that reason, the yield of the children with discalculia always is below normal".The age to detect a problem of discalculia is between the six and eight years, moment at which the mathematics are introduced as independent matter and can be compared the yield of children with others. But how can be recognized discalculia? Before nothing is important to distinguish between a boy to which the mathematics occur him bad and other that really has difficulties in the learning of these; the key to differentiate it is that " the yield in mathematics of a boy with discalculia is significantly inferior to the one of the rest of the students, he is always two or three courses underneath del that must tener" , Serra comments, in addition, in the majority of the cases, it is a delay that is demonstrated solely in this subject, since " in the rest of the mental areas its yield is developed within normality in relation to others compaeros" , it adds.Although it is not possible to be generalized, exist some tracks that can demonstrate an upheaval of discalculia, difficulties that can have the boy in one or several areas: Memory: Problems to remember basic concepts of Arithmetic, tables to multiply, meant of the symbols and to forget the steps to solve several calculations. .