Oregon Trail, Lemonade Stand, and Where in the World is Carmen San Diego were basically my holy trinity of educational games. The other educational game I remember, which was probably far more important than the three of these put together was some random typing game. I had a keyboarding speed of around 80wpm before I hit high school from playing that one.
BTW, you can still play them here:
* https://archive.org/details/msdos_Oregon_Trail_The_1990
* https://archive.org/details/msdos_Lemonade_Stand_1999
* https://classicreload.com/where-in-the-world-is-carmen-sandi...