打算盘 To calculate
【注音】dǎ suàn pán
【解释】算盘曾是账房先生不离手的东西，算盘打得好，账务一定也管得好。因此好的账房先生也有“铁算盘”的说法。现在算盘被计算器代替了，但是“打算盘”这个词仍保留了下来，不过表示的意思是筹划或计算得失。
Abacus was the old calculator for the accountant in the past, a good accountant must be good at using abacus, therefore, “an iron abacus” was a compliment for a good accountant. Now that abacus has been replaced by calculator , this term was still in use, only that the meaning has changed into being calculating, or petty and scheming.
【例子】
例1：李太太真会打算盘，买一斤排骨可以做好几个花样来吃，一家人好几天都在吃肉。
Ex.1：Mrs. Li is really a shrewd lady. She can cook one jin of ribs into various dishes and feed the whole family with meat for a couple of days.

例2：我希望你仔细地考虑一下，不要打错了算盘。
Ex.2：I advise you to think it over, don’t miscalculate.