計けい算さん違ちがい

noun

miscalculation; calculation error

Refers to an error in arithmetic or estimation, often implying a mistake in planning or judgment.

• 計けい算さん違ちがいで予よ算さんが足たりなくなった。

  The budget ran short due to a miscalculation.

• それは大おおきな計けい算さん違ちがいだった。

  That was a big miscalculation.