暗算

Reading

Kana: あんざん

Romaji: anzan

Definition

noun

vs

1

mental arithmetic

Kanji

暗

Readings: アン、 くら.い、 くら.む、 くれ.る

Meanings: darkness, disappear, shade, informal, grow dark, be blinded

算

Readings: サン、 そろ

Meanings: calculate, divining, number, abacus, probability

Example Sentence

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.