suan-pan

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The Chinese suan-pan has seven, and the Japanese soroban is the most compact of all, with five.

HERE’S LOOKING AT EUCLID Alex Bellos 2010
The Chinese suan-pan has seven, and the Japanese soroban is the most compact of all, with five.

HERE’S LOOKING AT EUCLID Alex Bellos 2010
The Chinese suan-pan has seven, and the Japanese soroban is the most compact of all, with five.

HERE’S LOOKING AT EUCLID Alex Bellos 2010
Around the year 1200, the Chinese refined the design, creating suan-pan, or the modern, wire-based abacus.

No. 2 The Abacus David M. Ewalt 2005