the three most popular abacuses were chinese japanese and indian
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The Chinese abacus, the suanpan. It may have 7, 9, 11 or 13 rods. ...
The Japanese abacus, the soroban. 9, 11, 13, 15, 17, 21, 23, 25, 27, 29 or 31 rods. ...
The modern soroban (since 1922, gaining popularity from 1945 onward). 9, 11, 13, 15, 17, 21, 23, 25, 27, 29 or 31 rods.
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