15 7/8 x 15 7/8 in. (40.3 x 40.3 cm) ...
33.5 x 33.25 in. (85.1 x 84.5 cm.) ...
Introduction Do you ever use math as a tool to solve interesting problems? In the 1970s math was often taught with simple worksheets. One teacher was looking for a way to help his students have more ...
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