Though few remember the feature exists, it was at least widely published by Apple when it was first implemented. However, there is similar functionality for basic mathematical calculations that will surprise even the most knowledgeable of self-proclaimed OS X gurus. First type the numbers you would like to perform the operation on, say 867*765. Now select the text and hit ⌘+Shift+8. Voila, the answer magically appears! C’mon admit it, you definitely didn’t know about that one.
