A Key to the Introduction to The National Arithmetic: Exhibiting the Operation of the More Difficult Examples in that Work : for the Use of Teachers Only

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Robert S. Davis & Company, 1864 - Arithmetic - 144 pages
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Page 52 - In the following questions, the new numerator is found by multiplying each numerator by the denominator of the other fraction ; and the common denominator is obtained by multiplying together the two denominators.

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