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Japanese counting board with grids
Japanese counting board with grids
Rod calculus facsimile from the Yongle encyclopedia
Rod calculus facsimile from the Yongle encyclopedia
Representation of the number 231 and possible misleading rod placements.
Representation of the number 231 and possible misleading rod placements.
Tian yuan shu in Li Zhi:Yigu yanduan
Tian yuan shu in Li Zhi:Yigu yanduan
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Toán trù 算籌 (counting rods) in a Vietnamese mathematics textbook, Cửu chương lập thành toán pháp 九章立成算法 is shown at the bottom of the page.
Toán trù 算籌 (counting rods) in a Vietnamese mathematics textbook, Cửu chương lập thành toán pháp 九章立成算法 is shown at the bottom of the page.
Rod numeral place value from Yongle Encyclopedia: 71,824
Rod numeral place value from Yongle Encyclopedia: 71,824
Japanese counting board with grids
Japanese counting board with grids
A checker counting board diagram in an 18th-century Japanese mathematics textbook
A checker counting board diagram in an 18th-century Japanese mathematics textbook