The common-core math standards require that students learn the standard algorithm for multi-digit adding and subtracting—you know, the process in which you line the numbers up vertically to add or ...
https://doi.org/10.5951/teacchilmath.23.9.0560 • https://www.jstor.org/stable/10.5951/teacchilmath.23.9.0560 Copy URL In an activity integrating mathematics and ...
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