暗算

Meanings

1. Noun, Suru verb, Transitive

   mental arithmetic

• トムは暗算あんざんが得意とくいだよ。

  Tom is good at mental math.

• 彼かれは暗算あんざんをするほど頭あたまが良よくない。

  He doesn't have enough brains to do sums in his head.

• 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.

• 彼かれは暗算あんざんが出来できるほど頭あたまが良よくない。

  He doesn't have enough brains to do sums in his head.

• いや算盤そろばんやってるから暗算あんざん得意とくいなのかと思おもって。

  No, I just thought that since you can use an abacus, you might be good at doing calculations in your head.