暗算

In sentences Furigana

トムは暗算あんざんが得意とくいだよ。 Tom is good at mental math. #9741381

彼かれは暗算あんざんをするほど頭あたまが良いくない。 He doesn't have enough brains to do sums in his head. #110180

暗算あんざんが出来できるほど彼かれは賢かしこくはない。 He's not smart enough to do math in his head. #5185699