Excerpt from Key to the North American Arithmetic, Part Second and Part Third: For the Use of Teachers
To those who have been accustomed to teaching arithmetic ana lytically, that portion of the Key which relates to the Oral exercises, will be useless. Nor need it be used b any teacher who will begin Part Second with a class, and p step by step, through cv' section. But it may ofien happen, that a teacher unacquainted vii the method of instructing in mental arithmetic, will be called to the instruction of a school, in which the scholars have already made some progress therein. In such mes, the solutions will be found convenient.
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