Here's a handy calculator that pops up at the touch of a button. Download Pluser and it installs itself on your Numbers Lock button. Hit Num Lock and it pops up. You work your problem using the numbers on the right side of your keyboard. Enter gives you the answer. Hit Num Lock again, and the little Pluser calculator window goes away. Of course, you can always put the calculator that came with your system on a shortcut. But that will take at least two or three keystrokes to call up. That's provided you remember the proper combination.