Assessing fifth grade children's rational number knowledge in a non-verbal application context: the darts game
In: Recherches en didactique des mathématiques, Vol. 7 Issue 3, page 51-741986

Construct a sum: a measure of children's understanding of fraction size
In: Journal for research in mathematics education, Vol. 16 Issue 2, page 120-1311985
Estimation and children's concept of rational number size
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Identifying fractions on number lines
In: Journal for research in mathematics education, Vol. 19 Issue 3, page 215-2321988
Order and equivalence of rational numbers: a cognitive analysis
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Order and equivalence of rational numbers: a clinical teaching experiment
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On children's quantitative concept of rational number: construct and estimate the sum
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Selected results from the rational number project
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