Common
Soroban
Japanese abacus
Soroban
The soroban (算盤, そろばん; counting tray) is a Japanese abacus derived from Chinese suanpan. The Chinese abacus and its operation method was introduced into Japan after mid 15th century. Then Japanese mathematics developed a distinct methos and adjust Chinese suanpan into smaller ones.A soroban has five bead on each rod, one bead above and four beads below. It's used for calculation and still be employed and taught in Japan.
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