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.

If you have been wondering how to convert documents created in Apple’s productivity apps like Numbers, Pages, or Keynote into other popular formats such as PDF, Microsoft Excel, Word, PowerPoint ...

Has someone sent you a .numbers file that you can't open in Excel on your Windows PC? Here's how to edit it using Apple's iCloud apps ...