Cálculo mental e a produção do conhecimento matemático

This text presents the research developed with students of the 5th year of elementary school at a public school in the city of Taubaté-SP, involved in solving problems involving the Mental Calculation. The read authors show that the Mental Calculation is relevant for the production of mathematical knowledge as it favors the autonomy of students, making it the most critical. Official documents that guide educational practices, such as the Parâmetros Curriculares Nacionais also emphasize that working with mental arithmetic should be encouraged as it has the potential to encourage the production of mathematical knowledge by the student. In this research work Completion of course the tasks proposed to students, who constituted the fieldwork to production data, were designed, developed and analyzed in a phenomenological approach. The intention, the research was to understand the perception of students in the face of situations that encourage them to implement appropriate technical and mental calculation procedures. We analyze how students express and realize the strategies for mental calculation in the search for solution to problem situations

Laboratório de Ensino de Matemática: uma extensão da sala de aula

This work has as purpose to present some boardings that assist in the process of mathematics teach-learning. We detach the Laboratory of Education of Matemática (LEM) and its main components. On the basis of the National Curricular Parameters, we display four activities that had been developed and applied in a Municipal School of the Public Net of Education in the city of Roseira. In the activities the mental arithmetic is developed, to study the elementary operations and concepts of horizontal segment and vertical segment. The results show that, with the development of the activities, as much the researcher as the teacher and its pupils had been more interested in arguing, teaching and to learn mathematics