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Mental arithmetic - Anzan
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〘 noun 〙 (also "ansan") 1. Calculation done in one's head. Calculation done without the aid of written calculation or an abacus. ※Elementary School Instructions (1872) "Mental calculation is done in one's mind without the aid of paper or pen." [Du Xunkaku - Travel Tales] 2. To think secretly about various things. In particular, to plot to deceive someone. ※Edo Hanjo-ki (1832-36) 5 "One man, calculating in his mind, what good fortune has come today?" Source: The Selected Edition of the Japanese Language Dictionary About the Selected Edition of the Japanese Language Dictionary Information |
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〘名〙 (「あんさん」とも)① 頭の中でする計算。筆算や、そろばんなどの助けなしでする計算。※小学教則（1872）「暗算とは胸算用にて紙筆を用ひず」 〔杜荀鶴‐旅寓詩〕② ひそかにあれこれ思うこと。特に、人をおとしいれることをたくらむこと。※江戸繁昌記（1832‐36）五「一人、腹中暗算し道ふ、今日何等の好辰」
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