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All About Grammar
Soroban Abacus 27-Digit Wooden Play Coins Useful TipsThe abacus was invented as a counting tool to count large numbers in ancient times. During Greek and Roman times, most abacuses were made of stones and metal. In the mid 16th century, the Chinese abacus which had seven beads in each column, two beads in the upper deck and five beads in the lower deck, was introduced into Japan. It became very popular, and was used especially by Japanese merchants as a calculation tool in business. In around 1930, the