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backupxentshsr
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Early calculating devices including the abacus {invented 500 years ago in China}, Napier’s bone [a set of rods invented in 1614 for basic maths operations].
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![Early calculating devices including the abacus {invented 500 years ago in China}, Napier’s bone [a set of rods invented in 1614 for basic maths operations].](https://cdn.slidesharecdn.com/ss_thumbnails/eraofcalculatingdevice-240628040750-a06cb4ba-thumbnail.jpg?width=640&height=640&fit=bounds)