ADD: if not doing anything fancy with your word processing, spreadsheets, or need to share in native formats, other apps that work well and are free.
Been an OpenOffice/LibreOffice user for years now for majority of my office needs. Simple Word docs and Excel spreadsheets are handled well with Libre. Apple's Pages and Numbers does a good job as well. If just keeping to yourself and or printing/PDF, don't need Office.
Only outlier, imo, is Powerpoint: always been an odd format, even within Office (seen templates not transfer correctly to newer Office versions). And if just viewing PP, believe MS has a program to view on Mac (and iOS has the full suite for free if have an Outlook.com account [not full featured, but enough there for basic stuff]).