ISSN 0021-8251 JOURNAL FOR RESEARCH IN MATHEMATICS EDUCATION NCTM Annual Dissertation Awards Instruction In Estimating Solutions of Whole Number Computations Harold L. Schoen, Charles D. Friesen, Joscelyn A. Jarrett, and Tonya D. Urbatsch Plaget's Concept of Number Development: Its Relevance ta Mathematlc:s Leaming Gis
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