算さん額がく

noun

votive tablet with a math puzzle

Historical term for a wooden tablet offered at a shrine or temple during the Edo period, inscribed with a mathematical problem and often its solution.

• この神じん社じゃには江え戸ど時じ代だいの算さん額がくが奉ほう納のうされている。

  A votive tablet with a math puzzle from the Edo period is dedicated at this shrine.