Word will let you format page numbers to an incredible degree of precision, but adding any kind of page numbering requires grappling with headers and footers, which can be off-putting for casual Office users. Fortunately, there is an easy workaround.
The official Word blog highlights something I had never actually noticed: there's a simple page numbering option on the Insert tab, which lets you add a page number (and automatically creates the appropriate header or footer). One minor trap: the Page Numbers option will be greyed out if you're not in Print Layout view. Hit the post for more details on how it works.