Insert section break (Insert, Delimiter, section break, Next Page) on the previous page where you want to insert a blank page, then insert section break in the inserted page, click View Header and Footer in the inserted blank page, place the cursor on the header and footer respectively, and then click the Link to Previous Section button. The text in the header and footer (the same as in the previous section) disappears and then closes. You can now insert a single header and page number.