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Practical and mental arithmetic on a new plan : in which mental arithmetic is combined with the use of the slate, containing a complete system for all practical purposes, being in dollars and cents

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Smith, R. C. (1856). Practical and mental arithmetic on a new plan : in which mental arithmetic is combined with the use of the slate, containing a complete system for all practical purposes, being in dollars and cents. Philadelphia: J.B. Lippincott & Co. Retrieved from https://archive.org/details/practicalandmen06smitgoog