Inca’s developed a method of recording numerical information that didn’t require writing. They tied knots onto other strands of string . They called these Quipu
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A quipu usually had multiple colors, spun, and plied thread or strings from llamaor alpaca hair. It could also be made of cotton cords. For the Inca, the system aided in collecting data and keeping records, ranging from monitoring tax obligations, properly collecting important records, calendric information, and military organization. The cords contained numeric and other values encoded by knots in abase ten positional system. A quipu could have only a few or up to 2,000 cords
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