Chapter Numbers in Page Numbers in Microsoft Word
The most commonly made mistake when wanting chapter numbers with your page numbers is knowing the rules.
You must use Outline Numbering in the style you use for your headings. While Word will allow you to use any heading style to provide the chapter number, it will ONLY allow use of a heading style (Heading1, Heading2, and so on), and no other style.
You may use a workaround to get the chapter numbers into your page numbers. However, if you expect to use an electronic table of contents, you MUST use Outline numbering.