Introducing an old calculating instrument in a new technologies environment: a praxeological analysis of students' tasks using different registers

Abstract

The Chinese abacus is the resource presented in this paper, to teach and learn number sense and place-value system at primary level. The Chinese abacus can be material, virtual (software) or drawn on a worksheet. We present three tasks and analyse them in term of techniques and relative knowledge. We show how these tasks can be solved by students in different registers (material, software, paper-and-pencil, fingers, oral) which is important for both students' understanding and teachers' activity. KEYWORDS Material and virtual resources, praxeology, task, technique, technology, register, number sense, place-value system, Chinese abacus. R\'ESUM\'E Le boulier chinois est la ressource pr\'esent\'ee dans cet article, pour enseigner et apprendre la construction du nombre et le syst\`eme de num\'eration d\'ecimal \`a l'\'ecole. Le boulier chinois peut \etre mat\'eriel, virtuel (logiciel) ou dessin\'e sur une feuille. Nous pr\'esentons trois t\aches et les analysons en terme de techniques et connaissances sous-jacentes. Nous montrons comment ces t\aches peuvent \etre r\'esolues par des \'el\`eves dans diff\'erents registres (mat\'eriel, logiciel, papier-crayon, mains, oral) ce qui est important pour la compr\'ehension des \'el\`eves et \'egalement pour l'activit\'e des professeurs.

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