He mentioned how long grades took him to calculate because he had a lot of custom weighting for stuff, and he was doing everything with a Texas Instruments calculator, and he was dreading it because the semester was almost over. I said something like "Couldn't you do this with Excel or something?"
He didn't really know what Excel was, but my dad had like a week before taught me how to use it for basic number crunching stuff, so I loaded it up on his computer, and showed him some very basic arithmetic stuff, and how to use cells as variables and roughly how copying and pasting worked. He was immediately amazed and I left feeling super smart.
The next week, I chatted with him again, and he had completely overtaken my Excel ability. He learned a bunch of little tricks I was unfamiliar with, had redone all of the gradebooks with it, added a lot of conditionals, color coding, and I think might have even been using the VBA. He also added graphs to look at how much he had to curve things and to see if tests were fair. It was life-changing for him; a task that used to take him hours of manual work was reduced to about fifteen minutes of playing copypaste.
Excel is particularly interesting to me, because it's very immediately useful, but you can also go super deep with learning new features, and it keeps getting more useful!
They give you access to a lot of programming logic, they're visual, they're reactive, they're easy to learn, and maybe most importantly, the results are instant. Instead of having to try and understand data types and scope and having to run a program from scratch for every change, you can just change a value and see the result right away.
I use spreadsheets for nearly anything involving "numbers" (outside of stuff with lots and lots of data), because it's a lot less of a headache than setting up a "real" language. They're wonderful.