ABSTRACT: This study was undertaken to investigate the effect of teaching aids on the performance of pupils in Mathematics in primary schools in Kitgum District. The case of selected primary schools in Mucwini Sub County. _ .. A qualitative research technique was selected for this study usmg a variety of research instruments. The subject in the study included the D.E.O, 3 head teachers, 32 teachers, 196 pupils, 80 parents and 24 School Management Committee who were randomly selected. The instruments that were used in the study included self-constructed questionnaires and interview guides. The data obtained from the study were analyzed qualitatively. Frequency tables and percentages were used to present and analyze the data. Data obtained from the interview were equally analyzed. The researcher made a summary of the significant findings of the study among the research questions as presented below: • There is an inadequacy of instructional materials provision at Lagotcugu CC Mucwini Sub County. • Training of teachers has a great impact on the teaching-learning process. This enhances pupils' academic performance. • Teachers' laxity and lack of commitment in teaching and incompetence in using instructional materials cause pupils not to receive proper teaching and can not read, interpret and write Mathematical statements in word form correctly. Such pupils lose interest in Education and perform poorly.