I am probably going old school a bit with this suggestion, but it is hard to beat a handy portable calculator when you need to do some numbers. From a small calculator you can find in a checkbook to a scientific version as a standalone device or on a smartphone, it is hard to beat a calculator when dealing with the real world.
Beyond a calculator, a spreadsheet that you can carry in your pocket is my own personal favorite. With just such a device I can stay on top of many things, from financial to physics (and physical) applications, and run what-ifs until I am content with the outcome. Being able to do that makes a simple calculator or pocket spreadsheet a very nice kind of gadget to have. Although, to this day, I cannot understand why no one has brought out the dedicated stand alone spreadsheet device.
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