Why do so many Mac computer applications, look like their physical counterparts? If want a quick answer and make fewer mistakes, you can use a calculator utility that works well on your Mac.
Quick Calc was developed to make calculations more quickly and to minimize mistakes while staying out of sight.
The calculations can be entered in a standard format, such as 2 * (3 +4), and offers a number of useful math functions that can also be entered, in addition to those you would expect to be included.
If you want to chain calculations, you can use the "ans" function, which includes the last value, and helps you to enter something like: Ans*2, where Ans is the end result.
The resizable window can be as wide as your Mac's desktop so that you do not run out of room for entering very long these calculations. Quick Calc's User Guide provides a complete list of supported features for quick reference.
NOTE: To buy Quick Calc via the App Store an Apple account is required.