Basically the subject says it all. Viewing help, doesn't help (ironically) since it shows just some Calculator: Frequently asked questions.
Windows – How to view Windows 8 calculator shortcut keys
calculatorkeyboard shortcutswindows 8
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Best Answer
It's weird that this isn't in the help file, you're right. http://windows.microsoft.com/en-US/windows7/Keyboard-shortcuts has a very extensive list of shortcuts for the calculator (as well as other things).