Estimation and mental computation : 1986= 1986 yearbook / ed. Harold L. Schoen, Marilyn J. Zweng

Estimation and mental computation : 1986= 1986 yearbook / ed. Harold L. Schoen, Marilyn J. Zweng . - Reston : National Council of Teachers of Mathematics, imp. 1988 . - VIII, 248 p. : il. 24 cm
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