Chinese Abacus
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A Chinese abacus used to calculate numbers.
Galleries
Miscellaneous Math ToolsSource
Ellsworth D. Foster ed. The American Educator (vol. 1) (Chicago, IL: Ralph Durham Company, 1921)
Downloads
1451×2400, 636.5 KiB
619×1024, 114.4 KiB
386×640, 64.5 KiB
193×320, 23.8 KiB