電でん卓たくを叩たたく

expression, godan verb (-ku)

use a calculator; punch numbers into a calculator

Literal meaning: physically tapping the keys of a calculator. Often used when doing arithmetic or checking figures.

• 経けい費ひを計けい算さんするために電でん卓たくを叩たたいた。

  I used a calculator to work out the expenses.

expression, godan verb (-ku)

calculate cost-benefit; weigh the pros and cons; run the numbers

Figurative extension: carefully evaluating whether something is profitable or worthwhile, as if punching numbers into a calculator. Often used in business or personal decision-making contexts.

See also: そろばんをはじく

• 新あたらしい事じ業ぎょうを始はじめる前まえに、しっかり電でん卓たくを叩たたいてみた。

  Before starting the new business, I carefully ran the numbers.