What part are you having trouble with? Saving the PowerPoint files as PDFs? Or getting them to the iPad?

If it’s the former, you should just be able to save the slides as a PDF (File, Save As PDF), but if that doesn’t work you can try going to print the slides except when you click the drop down box to select the printer, there should be an option called Microsoft Print to PDF.

When you select that option and then hit print, a new box will pop up asking where to save the PDF.

If you have them as PDFs already, you should just be able to email yourself the docs and then open them up via Acrobat, but you’ll have to download Acrobat from the App Store first.

If you’re trying to do all of this via iPad, I can’t help you there. Let me know if the above works or not, happy to try to help troubleshoot further.