"Quick calculation" refers to the act of performing a mathematical problem or figuring out an answer rapidly, without taking much time or effort. Full definition
Simple tools like this can be useful for quick calculations on the fly. (wisemoneytips.com)
If you love the subject of mathematics and are highly competent in making quick calculations, the job of a math coach is ideal for you. (bestsampleresume.com)
There's an interactive live tile for the calculator as well, letting you perform quick calculations right from the start screen. (windowscentral.com)