Mathematics is a topic very important to achieve success during education and for life. In this way, the factors that could influence on mathematics learning, from the point of the view of parents, were analyzed. The approach used in this study was the grey clustering method, which is based on the grey systems theory. The case study was conducted in Lima, Peru. The sample of parents was obtained at the final stage of national competition of mathematics, commonly called CONAMAT, carried out after of previous stages of classification. The parents were divided in two groups, primary education parents and secondary education parents. The results revealed that the factor more important that influenced on the preference from students for mathematics learning were the vocation from students to sciences and the motivation from students to mathematics. The results of this study could help to mathematics teacher or educational authorities from Peru to make the best decision on mathematics teaching and learning. Moreover, the grey clustering method showed its effectiveness during the application on the case study, and it could be applied to other studies from social sciences or educational sciences, as the grey clustering method considers the uncertainty within its analysis.