When you print PDF documents from the Adobe Reader, click the printer icon and a Print box pops up. On that popup, uner Page Handling, Page Scaling is a blue arrow with options Fit to Printer Margins, Reduce to Printer Margins, None, and Multiple Pages per Sheet. Adobe automatically picks up whatever printer you're using; if you want to change paper size, then click on the Properties box and change if necessary. If you're using A4 paper, the scaling feature in Adobe's print window should help you to size the 8.5 x 11 page size to fit your A4 page. Not only that, Adobe shows a preview of the page to be printed.