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The abacus is a deceptively simple calculating tool that contains beads or disks that can be moved up or down or from side to side. It helps provide a concrete understanding of counting, adding, subtracting and dividing. The abacus is the olden form of our calculator, its origins dates back to 2400 BC when the Babylonians used pebbles and dust abacus for their calculations.
Vedic Maths Classes by Xtragenius
Abacus mental arithmetic