The main question which directed the investigation was: how does the pedagogical practice of Mathematics teachers of IV cycle in schools that adopted the scholastic organization by basic cycles of learning occur? The study had as theoretical and methodological base the schooling in cycles and the school effect, and as its locus two schools of the municipal public system of Belém- Pará. The production of information involved, respectively of each school: one Mathematics teacher of the IV cycle, one pedagogical coordinator and the students of a class of the IV cycle. The methodological process included the following stages: solid observation of the Mathematics lessons of two classes during a school semester; interviews achieved with the pedagogical coordinators and with the Mathematics teachers; application of social and economic forms and a test similar to that of Prova Brasil, 2007, to the students of the two classes involved in this study. According to the finalization of this study it is possible to conclude that: the teachers, despite their difference of age, as well as their different time and space of formation, presented very similar pedagogical practices, marked by the predominance of oral exposition as their teaching methodology; both of them, despite their long work in schools organized by cycles, stood contrary to the evaluative procedures adopted by their schools concerning the promotion of students, and it is so because they believe that this way of promoting did not stimulate a better commitment and involvement of most of the students in the teaching-learning process, allowing the students to conclude the cycle without the necessary knowledge/skills to obtain the success to go on with their formation. Both investigated teachers were assiduous, responsible for their work and concerned about their students’ learning process. The result of the simulated evaluation to which the two groups of the two schools were subjected pointed that, related to cognitive learning in Mathematics, during the year of 2009, the investigated classes presented very similar results, which did not allow us to affirm whether the teachers practice was a determinant factor in the successful results presented by the students. Finally, we considered as important to stand out the necessity of a larger number of researches concerning the school effect, especially works directed to the questions inherent to the rich universe of the classroom and to the task of being a teacher.