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INCA. What did they invent?. They invent calendar. They have twelve months per year. Thirty days per month. Every year add five days and every four add one day. quipu. INCA use rope to record things . Just like they use Quipu to show amount 。. operation.
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What did they invent? • They invent calendar They have twelve months per year. Thirty days per month. Every year add five days and every four add one day.
quipu INCA use rope to record things. Just like they use Quipu to show amount。
operation INCA very good at medicine. For example, they can do operation in people’s head.