International audienc

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The first purpose of the books of commercial arithmetics which were produced in France during the 15th Century is to train to mathematics devoted to commerce. In this purpose, money is an essential matter, and these treatises give us valuable information about currency and, through the exercises, about the merchant life and customs of that time. But the real subject being to teach practical mathematics, we intend to discuss in this paper what use of money is made by the authors, and how mathematical priorities can affect the reality of commercial exchanges.