Search results for author:"Athanasios Gagatsis"
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Classical versus Vector Geometry in Problem Solving. An Empirical Research among Greek Secondary Pupils
International Journal of Mathematical Education in Science and Technology Vol. 32, No. 1 (2001) pp. 105–25
Presents an analysis of written solutions to geometry exercises in the last year of Greek Lyceum which showed relatively low performance on vector methods. Justifies pupils' false preconceptions with regard to the concept of vectors, and the strong...
International Journal of Mathematical Education in Science and Technology Vol. 45, No. 2 (2014) pp. 159–173
The study aimed to investigate students' conceptions on the notion of absolute value and their abilities in applying the specific notion in routine and non-routine situations. A questionnaire was constructed and administered to 17-year-old...
Learning and Instruction Vol. 17, No. 6 (December 2007) pp. 658–672
This study investigated the role of different modes of representation, i.e., verbal description, decorative pictures, informational pictures and number line, in solving additive change problems. Data were collected from 1447 students in Grades 1, 2, ...
International Journal of Mathematical Education in Science and Technology Vol. 39, No. 3 (April 2008) pp. 313–324
In this study, we attempt to put in question students' spontaneous and uncritical application of the simple and neat mathematical formula of linearity. This is impelled with the help of a written test involving geometrical problems, which is based...