Assessing fifth grade children's rational number knowledge in a non-verbal application context: the darts game
In: Recherches en didactique des mathématiques, Jg. 7 H. 3, S. 51-74
Identifying fractions on number lines
In: Journal for research in mathematics education, Jg. 19 H. 3, S. 215-232Research problems in mathematics education - III
In: For the learning of mathematics, Jg. 4 H. 3, S. 22-23