Apply constructivist view of the teaching and learning of athematics, teacher organize learning activities, construct situations, to guide students research and discover, building knowledge. Students initiative and active learning with understand and them skills. They cooperate with together students to construct of knowledge. Teacher pay attention to problems as: conception of students, set up connection conception with new knowledge, create vibrant atmosphere, encourage students to present their conception and to argue, Teacher prepare good questions and pedagogical situations. Teacher create opportunities to students participate assessment.