We constructed and calibrated an instrument targeting conceptual and procedural fraction knowledge. We used this instrument in a quantitative study with 126 secondary students (7th and 9th graders), testing the hypothesis that there are individual differences in the way students combine the two types of knowledge. Cluster analysis revealed four…

In this study we propose a classification system for spelling errors and determine the most common spelling difficulties of Greek children with and without dyslexia. Spelling skills of 542 children from the general population and 44 children with dyslexia, Grades 3-4 and 7, were assessed with a dictated common word list and age-appropriate…

The study aimed at providing evidence for the development of children's beliefs about everyday reasoning. A total of 116 third, fifth, and seventh graders participated in the study. They were examined individually with 14 everyday thinking scenarios which have been developed by Amsterlaw (2006). After each scenario, children were asked to evaluate…