Soroban abacus | Suanpan abacus | Maya numerals | |
---|---|---|---|
Video | https://www.youtube.com/watch?v=Px_hvzYS3_Y | https://www.youtube.com/watch?v=CvsnftXXKdw | https://www.youtube.com/watch?v=cVPOSvPNn28 |
Wikipedia | http://en.wikipedia.org/wiki/Soroban | http://en.wikipedia.org/wiki/Suanpan | http://en.wikipedia.org/wiki/Maya_numerals |
Civilization | Japanese | Chinese | Maya |
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