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Cognitive flexibility and reasoning patterns in American and German elementary students when sorting addition and subtraction problems
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In: Proceedings of the Ninth Congress of the European Society for Research in Mathematics Education ; CERME 9 - Ninth Congress of the European Society for Research in Mathematics Education ; https://hal.archives-ouvertes.fr/hal-01281858 ; CERME 9 - Ninth Congress of the European Society for Research in Mathematics Education, Charles University in Prague, Faculty of Education; ERME, Feb 2015, Prague, Czech Republic. pp.339-345 (2015)
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