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…

In recent decades, research has shown the challenge posed to teachers by science education in informal contexts such as science museums or centres. In addition, there is consensus that in the case of pupils visiting a science centre, learning improves when the visit is connected to the classroom curriculum, so the teachers' involvement in…