Abstract The purpose of this report has been to analyze students’ beliefs about mathematics and its relationship with their academic performance. The methodology used is quantitative, coupled to two study analyzes, the descriptive and the correlational, based on a non-experimental type design, correlational-causal transverse, since it seeks to explain the relationship between the variables. The technique used for data collection was a structured questionnaire, of questions of the Likert Scale type, which was applied to 121 students of 3 grade of primary basic education, belonging to a public educational institution of “San José de Cúcuta, Colombia”, selected by non-probabilistic sampling. This instrument was submitted to the respective analyzes that determined its validity and reliability. For academic performance the instrument of characterization of skills and procedures used by third grade students in the area of mathematics was used, designed by the all to Learn program of the “Ministerio de Educación Nacional, Colombia”. The results show that beliefs about mathematics, from the perspective of students, are a factor in the academic performance of that area.