There’s a lot of math built into the game Stardew Valley.
You farm, raise animals, mine, and can do quite a few other things.
One person spent about 4.5 years making this game and it became pretty popular.
This video looks at one situation and how you can use equations to figure out what to do.
Potentially they are equations you could use on homework or a test if you’re a teacher.
I also talk about the idea of a limiting factor which is a usual concept actually for many things. I think I first heard about it in chemical reactions.