Lots of ways to teach that the kids can also enjoy. Just give them attention and the opportunity.
We can almost close the thread on that note. 1) There’s more than one way to skin a cat.
2) Attention and opportunity. And that can be repeated… and repeated… The rest is entirely up to the values/mores/world view of the people involved. What did Rocky say in the first movie: You hang out with smart people, you get smart friends. You hang out with yo-yo people, you get yo-yo friends! Y’see, it’s simple mathematics Translation: What’s important to you?
And I submit you don’t have to do anything intensive or test them on anything. Just expose them to things. They’re young. Just the exposure will have it’s effect and be of utility years later. There is a danger is making learning too much work. It can kill the desire to learn.