Students’ difficulties dealing with number line: a qualitative analysis of a question from national standardized assessment”, Quaderni di Ricerca in Didattica (Mathematics)
Articolo
Data di Pubblicazione:
2015
Citazione:
Students’ difficulties dealing with number line: a qualitative
analysis of a question from national standardized assessment”, Quaderni di Ricerca in Didattica (Mathematics) / A. Lemmo, L. Branchetti, F. Ferretti, A. Maffia, F. Martignone. - In: QUADERNI DI RICERCA IN DIDATTICA. - ISSN 1592-4424. - 25:Supplement 2(2015), pp. 143-150. ((Intervento presentato al 67. convegno CIEAEM : 20 - 24 Luglio tenutosi a Aosta nel 2015.
Abstract:
In this paper we analyse some peculiar students’ mistakes in a task selected from the Italian National
Mathematics Standardized Tests. In particular we show different types of errors identified in the solutions of
grade 6 students who faced an item that involved the management of the number line. We use both the
statistical results of the national sample and the qualitative analysis of answers in a smaller sample of 181
students. Our study draws on previous research on difficulties that students face placing rational numbers on
the number line. We use an intertwinement of different theoretical lenses to explain the possible causes of
failure. We show how some students’ answers can be interpreted as results of different misconceptions. The
identified mistakes are related both to the management of the rational numbers representations (i.e. decimal
representation and fraction) and to the manipulation of the graduate scale of the number line.
Tipologia IRIS:
01 - Articolo su periodico
Elenco autori:
A. Lemmo, L. Branchetti, F. Ferretti, A. Maffia, F. Martignone
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