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算額（嘉永三年奉納） 算額（安政六年奉納） 算額（元治元年奉納）
| Cultural property name | Sangaku (Dedicated in 1850) Sangaku (Dedicated in 1859) Sangaku (Dedicated in 1864) |
|---|---|
| Commentary | After arriving from ancient China to Japan, mathematics underwent a unique development. This is a votive picture tablet (ema) with Japanese mathematics. Sangaku is a votive picture tablet with a math problem that one created oneself, and those who looked at it were supposed to solve the problem. It was dedicated to a shrine or a temple. In many cases the picture on the sangaku was colored, and these decorative votive picture tablets stood out. Thus, in addition to wishing for success in school and study, those who dedicated sangaku were probably seeking to make a name for themselves by presenting difficult math problems. What is noteworthy is that these three sangaku were dedicated by residents of the area around Miyamasucho, which was where an area of samurai residences and a commercial district came into contact with each other. Among the three, the one that was dedicated in 1859 was done so by a samurai from Saijo Domain. Additionally, the sangaku dedicated in 1864 is an extremely rare type it being fan-shaped. |