Translation of "Arithmetic" in Japanese

He's good at arithmetic.

彼は計算が得意だ。

Arithmetic deals with numbers.

算数は数を取り扱う。

Accuracy is important in arithmetic.

算数では正確さが重要だ。

He couldn't do even simple arithmetic.

彼は簡単な算数すらできなかった。

The boy can solve any problem in arithmetic.

その子は算数ならどんな問題でも解ける。

He isn't smart enough to do 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.
- He isn't smart enough to do mental arithmetic.
- He isn't smart enough to add up numbers in his head.
- He's not smart enough to add numbers in his head.

- 彼は暗算をするほど頭が良くない。
- 彼は暗算が出来るほど頭が良くない。
- 彼は暗算が出来るほどの頭脳を持ち合わせていない。