How do I add line numbers?

Pages does not have any easy switch to show or hide sequential numbers for each row.

You can switch on paragraph numbering in the Inspector > Text > List, but as soon as a paragraph goes over several lines, it will be out of sync.

Apple suggests that you create a numbered text box and put it on the master slide.



However, that kind of list will not work if you change the font size, like for a title, or if you insert an image that spans the full page width and disrupts the numbering.