Through this paper we want to study the relationship between the presence of A.D.H.D and the capacity of solving problems at children. Also, we do want the operalisation of the A.D.H.D concept, and we want to find an instrument to study this variable. It was also our goal to identify the relationship between the presence of A.D.H.D and the capacity of solving problems at children. The A.D.H.D variable was identified through the Evaluation Scale of A.D.H.D, Dr George Du Paul being the author. Regarding the hypothesis, the work was started from the ideea that it exists a negative correlation between A.D.H.D and the control paper grade. It exists a negative correlation between A.D.H.D (attention deficit-hyperactivity factor) and the control paper grade and the last hypothesis was that it exists a negative correlation between A.D.H.D (impulsivity-hyperactivity factor) and the control paper grade. The intelectual performance of the subjects was measured through the C.P.M. test, and the capacity of solving problems was identified through a five mathematics problems control paper.The research was made on a group of eighty subjects(45 girls and 35 boys), pupils in the first grade, with ages betwen 7 and 8 years. though it is difficult to deal with a child who has A.D.H.D, this one can succesfully learn and study, and can change his unusual behaviour as long as he|she receives professional help.