@Suiseiseki I forgot gnumeric! But I was thinking I have to showLibre Office's Calc. One of the Moms is hesitant about erasing Windows because she might use Excel. A neighbourhood guy that does a Karaoke bar wants his old PC to move better so he can do Spreadsheets too. If they show me what they do we can probably figure out how to do it with Calc. The ancient machines I use as demos might hang with Office apps though. Org-mode tables would be more fun but not the laddrer's low rung.