हाउ मेनी पार्ट ऑफ अबेकस
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- The abacus is made of a metal plate where the big ran in grooves. Other than this, the Romans also invented three different types of abacus. The Chinese abacus, known as the suanpan usually contains more than seven rods with two beads on each rod in the upper deck and five beads each in the bottom.
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