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INCA

INCA. What did they invent?. They invent calendar. twelve months per year Thirty days per month Every year add five days E very four add one day. quipu. INCA use rope to record things Just like ： use Quipu to show amount. operation. Good medicine For example ：

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INCA

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  1. INCA

  2. What did they invent? • They invent calendar twelve months per year Thirty days per month Every year add five days Every four add one day

  3. quipu INCA use rope to record things Just like：use Quipu to show amount

  4. operation Good medicine For example： do operation in people’s head.

  5. THANK YOU

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