The book presents a didactic strategy that conceives the attention to individual differences as a transversal axis in the teaching-learning process of Mathematics in 9th grade of the first cycle of the secondary level. In addition, methodological considerations for the practical implementation of the actions contained in the proposed strategy that guide the teacher in the use of the potentialities of the content category for the treatment of individual differences are highlighted. The results in the practical application of the research proposal through the methods used and the quantitative and qualitative analysis showed progress in the three established indicators and their effectiveness.