Students' mental manipulation of a shape at the early educational level
In this article we present results of research aiming at describing the strategies used by 10-year-old children while solving one geometric task. The research was lead through three different stages. In May 2015 the Educational Research Institute in Poland carried out a survey titled Competences Of Third Grades. One task, related to the domain "the geometric imagination", solved by 199 361 students, achieved a low degree of solvability, also among students achieving good results in other educational...