Changes

Then <b>right-click</b> on the selection (on a Mac, hold down the Ctrl key and click). You'll see a <b>context menu</b> appear. At the bottom of the menu should be a line that says "Ubiquity". Move the mouse over this and a sub-menu will appear containing a variety of Ubiquity commands, like so:

Select "Calculate". You'll see the result of calculating the expression.