In this research I intended to investigate which practical knowledge a future Mathematics teacher has developed while participating in the activities of the Mathematics Education Laboratory of the Universidade da Amazônia (Lema/UNAMA). In this case study, I identified the acquisition of some traces of practical knowledge by this future teacher while he was teaching Mathematics for public schools students at UNAMA campus, in the context of Lema/UNAMA, and, under my orientation. I observed the learning processes related to the forms of organization, argumentation and evaluation of the contents taught during classes, which I called anticipated teaching situations – SAE. All SAE were video recorded and transcribed in order to support reflections along subsequent interviews. In short, the results showed four significant learning processes related to the future teacher s practical knowledge: the rupture of the egocentric discourse; the adoption of the concept-decentralized discourse; the valorization of the pedagogical content knowledge; and the autonomy (moral and intellectual) mediated by collaboration.