Abacus
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| Fig: Abacus |
An abacus is a kind of earliest/oldest
calculating device based on decimal number system. It is used by sliding
counters along rods to perform simple mathematical calculations. Such as
addition, subtraction, multiplication and division.
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It was invented about 3000 years ago in China.
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It is made from wooden frame.
- It has two parts one is upper part /upper deck and
another is lower part /lower deck.
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Upper part is also called ‘heaven’ and lower part is
called 'earth'.
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Heaven and earth separated by beam.
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Heaven contains 2(two) beads and earth contains 5(five)
beads.
