Numbers has the ability to open Excel files so you can work on them. You can also export spreadsheets in Numbers so that they are compatible with Excel.

While it’s not quite as easy as opening .docx files in Pages for Mac, it’s not an overly complicated process either. Here's how to open .xlsx spreadsheet files on Mac, iPhone or iPad.

Although Apple's Numbers spreadsheet application cannot open or edit PDF documents, you can still use the program to generate a PDF file through OS X's Print As PDF feature.