Translation guide
The ability to perform calculations in one's head without external aids. In Japanese, this is commonly referred to as 暗算 (あんざん), but other expressions exist for different contexts.
The act of calculating in one's head, without pen, paper, or calculator.
The standard term for mental arithmetic. Used in everyday conversation and educational settings.
彼は暗算が得意だ。
He is good at mental arithmetic.
暗算で計算してください。
Please calculate it mentally.
Literally 'calculate in one's head'. A more descriptive phrase, often used when explaining the process.
頭の中で計算するのは難しい。
It's difficult to calculate in my head.
Verb form of 暗算. Used to say 'do mental arithmetic'.
電卓を使わずに暗算してみて。
Try doing it mentally without a calculator.
A specific method of mental arithmetic using an imaginary abacus, often taught in Japanese schools.
Refers to the technique of visualizing an abacus to perform calculations. Common in abacus (soroban) education.
珠算式暗算を習っている。
I'm learning abacus-based mental arithmetic.
Alternative term for abacus-based mental arithmetic, using 'soroban' (abacus).
そろばん式暗算は集中力を高める。
Abacus-based mental arithmetic improves concentration.
Shortcuts or tricks for doing mental arithmetic quickly.
Tips or tricks for mental arithmetic.
暗算のコツを教えてください。
Please teach me some mental arithmetic tricks.
暗算 is the most natural and common way to say 'mental arithmetic'. It can be used as a noun or with する to form a verb. In casual conversation, you might hear 暗算で (by mental arithmetic) as an adverbial phrase.