A mathematical tablet called sangaku which was dedicated to the Suwa Jinjya-the Shinto shrine in Mishima is conserved at the Mishima Country Museum. It is a historical work which shows the wasan-the traditional Japanese mathematics in Edo Period of Japan. However, it has become dark due to the deterioration by aging. Then, we have tried to restore the sangaku through the drawing by computer. Also, from the literature, we have inferred the early solution in Edo period.%嘉永2年（1849年）に長岡市七日市（旧三島郡三島町大字七日市）の諏訪神社に算額が奉掲された．この算額は，現在三島郷土資料館で展示されている．三島郷土資料館では，他に和算書の『算法新書』，計算用具の算木なども展示されており，和算に触れることが出来る貴重な場である．額文によれば，算額の奉掲者は三島の吉原吉之重来義で，安立清兵衛敬の門人とある．
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