Identifying fractions on number lines
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In: Recherches en didactique des mathématiques, Jg. 7 H. 3, S. 51-74Bericht von der 1985er PME-Tagung
In: Zentralblatt für Didaktik der Mathematik, Jg. 18 H. 2, S. 69-71The role of technology in the cognitive development of mathematics learners
In: The journal of mathematical behavior, Jg. 5 H. 2, S. 209-232Construct a sum: a measure of children's understanding of fraction size
In: Journal for research in mathematics education, Jg. 16 H. 2, S. 120-131Order and equivalence of rational numbers: a cognitive analysis
In: Journal for research in mathematics education, Jg. 16 H. 1, S. 18-36Inconsistent student behavior in applicational situations of mathematics
In: Proceedings of the Ninth International Conference for the Psychology of Mathematics Education, Jg. vol. 1: Individual contributions, S. 362-3681985Selected results from the rational number project
In: Proceedings of the Ninth International Conference for the Psychology of Mathematics Education, Jg. vol. 1: Individual contributions, S. 342-351Order and equivalence of rational numbers: a clinical teaching experiment
In: Journal for research in mathematics education, Jg. 15 H. 5, S. 323-341Research problems in mathematics education - III
In: For the learning of mathematics, Jg. 4 H. 3, S. 22-23On children's quantitative concept of rational number: construct and estimate the sum
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In: Journal for research in mathematics education, Jg. 14 H. 3, S. 204-209Kalküle, Spiele und Lernen
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