Addition et soustraction dans les quipus ?

Pendant notre travail sur les quipus, je me demandais si les quipus servaient surtout à conserver des données (recensements, taxes, histoires, etc.) ou bien s'ils pouvaient aussi servir à faire des calculs mathématiques tels l'addition ou la soustraction. J'ai trouvé ce site qui semble répondre à ma question.

En voici un extrait:
Inkas Math Calculators Yupana and Math Record Keeping Quipu
by Liliana Usvat
The Inca king appointed quipucamayocs, or keeper of the knots, to each town. These individuals would car out calculations on the Yupana and transfer this numeric information to quipus which are strings of knots representing a base ten counting system. The quipucamayocs, who were essentially government statisticians, kept official census records, official produce numbers of their town, and records of the towns animals and weapons. This and other information was sent annually to the capital city Cuzco
Yupana
Archaeologists describe yupanas as boards made of clay, stone, wood carved or simply plotted on land, divided into five rows and four columns, thus forming squares where stones were placed, grains of corn or quinoa acquired a value based numerical position.
yupana  is an abacus used to perform arithmetic operations dating back to the time of the Incas.
Several chroniclers of the Indies described, unfortunately approximately, the Incan abacus and its operation.


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