Keynote 
Show or hide slide numbers
When you show slide numbers in a presentation, they appear at the bottom of each slide. Numbers are updated when you change the order of the slides. Skipped slides aren’t numbered.
You must be in navigator or light table view to add slide numbers.
Show slide numbers
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Select the slides you want to have slide numbers.
Shift-click to select contiguous slides, or Command-click to select any set of slides.
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Select the Slide Number checkbox in the sidebar.
If you don’t see a sidebar, or the sidebar doesn’t have a Slide Number checkbox, click
in the toolbar.
To hide slide numbers, select the slide or slides with numbers, then deselect Slide Number.
To show slide numbers for all slides in your presentation, choose Slide > Show Slide Numbers on All Slides (from the Slide menu at the top of your screen). To hide slide numbers for all the slides in your presentation, choose Slide > Hide Slide Numbers on All Slides.