Resumen

ZAKARYAN, Diana  y  SOSA, Leticia. Knowledge of practices in mathematics of a secondary teacher in geometry classes. Educ. mat. [online]. 2021, vol.33, n.1, pp.71-97.  Epub 06-Dic-2021. ISSN 2448-8089.  https://doi.org/10.24844/em3301.03.

Studies about the implication of specialization in a mathematics teacher’s knowledge are taking important role in the field of mathematics education research. From this perspective, the goal of this research is to study the knowledge of the practices in mathematics of the Mathematics Teachers’ Specialized Knowl-edge model (MTSK), contributing to understanding and characterization of the nature of this teacher knowledge. Through empirical data from classroom obser-vation and an interview with a high-school mathematics teacher we have been identified the teacher’s knowledge of the role of symbols and mathematical conventions; knowledge about the importance of proofs and their principal meth-ods, of the meaning and the role of necessary and sufficient conditions; equally, knowledge of heuristic strategies of problem solving and the role of generalization. We conclude by highlighting the importance of this teacher’s knowledge to favor the development of students’ abilities to do mathematics.

Palabras llave : Mathematics teachers’ specialized knowledge; practices in mathematics; geometry; mathematics teacher; high-school level..