Evaluation of computer- Abacus

 Abacus 

  • @ Also known as Abacus /  (counting frame ) #Wikipedia 

  • @The oldest known calculating Device is Abacus .

  • @which was invented in Asia over 2000 Years ago .

  • @The easiest widely used Mechanical calaculating Device 

  • @The abacus was used sumaraians,  And Egyptian as early 2000BC

  • @ Its use was widespread among the Romans ,Indians, Chinese, and Japanese 

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