The Best Free Online Calculator
Summary
Commands for the online calculator you can enter not only the mouse, but with a digital computer keyboard. Calculator performs mathematical operations in accordance with the order they are entered. The ancestor of the modern calculator is Abacus, which means "board" in Latin. Abacus was a grooved board with movable counting labels (stones or bones). Presumably, the first Abacus appeared in ancient Babylon about 3 thousand years BC.
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