Answers

In Microsoft Word do the following:

On the Insert tab, select Page Number

From the drop down menu, select Top of Page

Choose where you want the page number (left, middle, or right)

If you choose to have your page number right justified, type your header in front of your page number; then hold the space bar until your header is moved flush with the left margin. 

If you choose to have your page number left justified, type your header after your page number. Place your cursor between your page number and the beginning of your header, then hold the space bar until your header is moved flush with the right margin.