Key to the Olney's Science of Arithmetic: In which are Given Full Solutions of All the Examples, and Rules for the Solution of the Problems

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Sheldon, 1879 - Arithmetic - 148 pages
 

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Page 148 - The facility with which the books can be used for classes of all grades, and in schools of the widest diversity of purpose. Each volume in the series is so constructed that it may be used with equal ease by the youngest and least disciplined who should be pursuing its theme, and by those who in more mature years and with more ample preparation enter upon the study.

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