暗算
Noun
Irregular
Transitive
1
noun (common) (futsuumeishi)noun or participle which takes the aux. verb surutransitive verb
calcular de memoria;calcular mentalmente;aritmética mental
1
noun (common) (futsuumeishi)noun or participle which takes the aux. verb surutransitive verb
mental arithmetic
彼は暗算をするほど頭が良くない。
He doesn't have enough brains to do sums in his head.