The study advances the instrumental approach to mathematics education (Drijvers et al., 2013; Trouche, 2003), aiming to elucidate the interplay between students' reasoning competency, conceptual knowledge and tool utilisation in dynamic digital geometry and algebra environments. The dynamic properties of these environments pose a nuanced…

Information and communication technologies (ICTs) in basic education, i.e. K12 education, have often been constrained by sociocultural context and limited to pedagogical aspects, and these innovations have not yet catalyzed curriculum reform as expected. To address this research gap, this study adopted a key-competence-based subject knowledge…