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The abacus is at once one of the oldest, most enduring, and efficient products of the human mind. It appeared early before arabic numbers, so it doesn’t have a sense of numbers. abacus does the calculation according to the different beads and the position of them to represent different numbers. The upper bead represents 5 and each bead below the horizontal beam represents 1. And the beads are considered to be calculated when they move close to the horizontal beam. | The abacus is at once one of the oldest, most enduring, and efficient products of the human mind. It appeared early before arabic numbers, so it doesn’t have a sense of numbers. abacus does the calculation according to the different beads and the position of them to represent different numbers. The upper bead represents 5 and each bead below the horizontal beam represents 1. And the beads are considered to be calculated when they move close to the horizontal beam. | ||
[[Image:abacusUse1.jpg|700px|thumb|left|Reconsideration of abacus structure]] | |||
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