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" A number is a unit or a collection of units; as one, three apples, five boys. 4. The unit of a number is one of the collection of units which constitutes the number. Thus, the unit of twelve is one, of twenty dollars is one dollar. "
The Complete Arithmetic, Oral and Written, on the Basis of Works - Σελίδα 1
των Henry Bartlett Maglathlin - 1882 - 368 σελίδες
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Daniel W. Fish - 1874 - 516 σελίδες
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