The Progressive Mental Arithmetic, Vol. 2 (Classic Reprint) - Tapa dura

Sinopsis

Excerpt from The Progressive Mental Arithmetic, Vol. 2

IN his school work the author has felt the want of available exercises in mental arithmetic which would make for power to deal Off hand with number problems such as are met with out Of school. Conference with other school workers has shown that this feeling is shared by many. The progressive mental arithmetic is the result of an effort to meet this need.

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