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(width197、depth285、height30〜42 mm) Russian Soroban looks like a counting instrument for kids. Actually it is used for counting in a store. The beads are moved from the right hand side to the left in order to count and it can be used also for multiplication and division. |
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(width340、depth158、height27 mm) Soroban in Japan were brought from China (probably about 400 years ago), improved a lot and finally they developed into the ones we use today. Now in China, the economy is good and speed is required for counting. This is why Japanese Soroban are now increasing in China. |
Soroban international situation
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