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Keyword:  9-14 yr old street vendors & 1st-3rd graders
Schliemann, A. D., Araujo, C., Cassundé, M. A., Macedo, S., & Nicéas, L. (1998). Use of multiplicative commutativity by school children and street sellers. Journal for Research in Mathematics Education, 29(4), p. p422–435. Dernièrement modifiée par: Lynda Taabane  v    Pop. 32.6%
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