2026/05/10 (Sun.) Abacus Day
2026/05/10 (Sun.) Abacus Day
May 10th is Abacus Day (or Abacus Festival), but in Japan, it's actually called August 8th (88) Abacus Day. The "5/10" in abacus refers to the mnemonic "five up, ten down" or "up five, subtract four," which is the basic concept of abacus addition (e.g., adding 5, or making 10). It means that when the base number is insufficient, five and ten are used to make up the difference, for example, "add 1, find 4, up five, subtract four." ...
Administrative Unit:
Secretary's Office
Date:
2026/05/10
