Do first graders make efficient use of external number representations? The case of the twenty-frame

Title:: Do first graders make efficient use of external number representations? The case of the twenty-frame
Document type:: Zeitschriftenaufsatz
Author(s):: Obersteiner, A.; Reiss, K.; Ufer, S.; Luwel, K.; Verschaffel, L.
Journal title:: Cognition and Instruction
Year:: 2014
Journal volume:: 32
Pages contribution:: 353–373
Reviewed:: ja
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