Inhaltsangabe
Excerpt from A Key to the Practical Arithmetic<br/><br/>Tm: e to the Revised edition of the Practical Arithmetic, has been prepared at the suggestion of many eminent teachers, for whose opinions the author cherishes a high regard. But why should teachers want a Key, it is asked. It looks suspicious, says one. If they cannot solve the examples, they are not qualified for their station, adds another.
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