Adding Slide Numbers in Powerpoint 2010
Just like you have page numbers for books, it is usually a good idea to add slide numbers to presentations. There are two ways you can add slide numbers to your presentation and this chapter will show you both those techniques
Step (1): Under the Insert ribbon, Text group click on Slide Number command.
Step (2): The Header and Footer dialog opens up.
Step (3): Check the Slide number check box
Step (4): The Preview shows the section where the slide number will be placed.
Instead of clicking on the Slide Number command you could have also clicked on Header & Footer menu item to launch the same dialog as Step (2).