When you print your presentation, PowerPoint prints your slides starting with the first one. If your printer isn�t like the one described above, you have to take the printed sheets and rearrange them, unless you tell PowerPoint to print your presentation starting with the last slide.
To do that, just go to the Print dialog box (select Print from the File menu). In the Slides field in the Print Range area, enter the range of slide numbers you want to print, but in reverse order. (So if you want to print, say, a fifty-slide presentation, enter 50-1.) Then print your presentation.