Abstract
This article describes and identifies the personal meanings that the multigrade schoolteacher has in the teaching of the decimal metric system, through the facets of didactic mathematical knowledge. In various investigations supported by this theory, the need to apply the notion of facets or didactic suitability as an instructional process in which teachers are knowledgeable and competent in an academic setting, has been visualized. In this sense, the research is framed in teachers of different areas of knowledge that guide mathematics in which ten teachers participated. The data collection is based on the analysis of a diagnostic test and a semi-structured interview. Finally, as one of the relevant results of the research, three epistemic configurations are obtained from the personal meanings identified in the teachers interviewed.
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