Suanpan abacus

World > Education
2010-11-22 09:14:07
Calculation methods for counting (Abacus, Maya...)
Suanpan abacus
Videohttps://www.youtube.com/watch?v=CvsnftXXKdw
Wikipediahttp://en.wikipedia.org/wiki/Suanpan
CivilizationChinese
  • 2010-11-22 08:57:22
    2010-11-22 09:14:07
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