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The Number and Operations course for elementary and middle school teachers examines the three main categories in the Number and Operations strand of Principles and Standards of School Mathematics ...
https://doi.org/10.5951/teacchilmath.22.1.0020 • https://www.jstor.org/stable/10.5951/teacchilmath.22.1.0020 Copy URL Cajori, Florian. 1928, 1929. History of ...
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