This paper presents some results of an investigation on the number sense of a group of pre-service secondary teachers from Spain. The objective of this research was to analyze students' use of strategies associated to number sense and compare them with those obtained in a previous study with pre-service primary teachers in Taiwan, ( Yang, Reys & Reys, International Journal of Science and Mathematics Education, 7, 383-403, 2009). Pre-service secondary teachers showed lower success than pre-service primary teachers in a number sense test. Nevertheless, these last based their reasoning mainly on rules and algorithms, while pre-service secondary teachers used more strategies of number sense. In an attempt to delve into the low success shown by of Spanish pre-service secondary teachers, some students were interviewed. Those interviews showed that a deeper work on number sense in the training of these students is needed.Ministerio de Ciencias e Innovacion. Madrid EDU2011-29324
FONDECYT 3140597
PIA-CONICYT Basal Funds for Centers of Excellence. Chile BF000
Resumen • Se presentan resultados de una investigación sobre el sentido numérico de un grupo de estudiantes universitarios del Grado en Matemáticas en España. El objetivo de la investigación es estudiar el uso de estrategias asociadas al sentido numérico que manifiestan estos estudiantes. Los resultados muestran que, a pesar de la alta formación matemática de estos alumnos, manifiestan bajo éxito en las respuestas a determinadas cuestiones numéricas, cuando se les pide resolverlas siguiendo métodos no tradicionales de cálculo.
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