In het volgende bepalen we ons echter voornamelijk tot de basisvaardigheid van het schattend
opereren met natuurlijke getallen (aantallen en meetgetallen). Maar elementake maten …

In this study we compare 2 experimental programs for teaching mental addition and
subtraction in the Dutch 2nd grade ( N = 275). The goal of both programs is greater flexibility in …

Freudenthal was the founder of so-called realistic mathematics education. In it reality does
not only serve as application area but also as the source for learning. We take a newspaper …

In Dutch" WISKOBAS" stands for a particular kind of mathematics in the elementary school (ages
6-12). In tum Wiskobas was one of the depart ments in the IOWO, the Institute for the …

Innumeracy, as understood here, is the inability to handle numbers and numerical data
decently and to evaluate statements regarding sums and situations which invite mental …

Following an introduction on the relation between column arithmetic and mental arithmetic in
connection with the development of pocket calculators and computers, the characteristics of …

In this article we react to the studies in this special issue of Mathematical Thinking and Learning
on young children's understanding and application of subtraction-related principles. We …

Five Years IOWO Page 1 SPECIAL ISSUE F IVE YEARS IOWO On H. Freudenthal's Retirement
from the Directorship of IO WO IOWO SNAPSHOTS Page 2 EDITORS: H. Freudenthal GM …

This article discusses large-scale assessment of change in student achievement and takes
the study by Hickendorff, Heiser, Van Putten, and Verhelst ( 2009 ) as an example. This study …

In het volgende willen wij laten zien hoe betoverend het vak rekenen-wiskunde voor kinderen
kan zijn indien het in een rijke, flexibele, interactieve onderwijsomgeving plaatsvindt, dat …