Teachers must often analyze and select the educational resources they consider relevant for their students, being textbooks one of the curricular materials of preferential use. A textbook lesson shows the instructional process planned by the author to promote the learning of a given content by potential students, so it is essential that the…

The development in mathematical flexibility should be included in the mathematics teaching training of students in Primary Education Degree. Teachers in training have to acquire the skill to modify the problem resolution and be able to break with stereotyped methods. This document presents an analysis of spontaneous mathematical flexibility…

In this work, we show the results of a research with pre-service mathematics secondary teachers about their Van Hiele level regarding the proof in Geometry. We observe three different profiles whose characteristics are described. These descriptions allow us to foresee certain differences when carrying out proof teaching in secondary school. The…