The present research study began with the definition and formulation of the problem: How does the use of the didactic material "mathematical apron" optimize the development of the notions of classification and seriation in the children of 04 years old of the Initial Educational Institution N° 006 María Palmir Sánchez de Reategui; Luya Urco - 2023? Likewise, the general objective was. To analyze in what way the didactic material "mathematical apron" optimizes the development of the notions of classification and seriation, for which we worked with 25 children as a sample of study of the "Ordered" section; also the type of study carried out was applicative - explanatory. Therefore, the design used corresponded to a pre-experimental research, called pre and post test; before and after its application to check if the established purpose has been achieved according to the proposed objective...