What was the necessity that brought about the invention of calculating device?
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The first aids to computation were purely mechanical devices which required the operator to set up the initial values of an elementary arithmetic operation, then manipulate the device to obtain the result
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Even before numbers themselves were invented, people needed a way to keep track of the cost of goods they were selling. To fulfil this need, in ninth century China the abacus was invented- a basic calculating device made out of a wooden frame and counting beads.
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