Ready reckoner
Ein gerechnet bűchlein : "The town of Annaberg commissioned Riese to write this ready reckoner book containing tables of measures and prices so that a merchant could, if he knew the unit price, quickly determine the price of any quantity of an object. It also enable a baker to quickly find the proper weight for a loaf of bread when the price of grain was variable but the price of the baked loaf had to be kept the same."
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Ready reckoner
Adam Riese
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