This is the question most kids ask when offered education. If you answer that first, everything else follows.
Start with why. (Thank you Simon Sinek.) Are there meaningful, ongoing benefits to learning how to make specific decisions with your money? Should you care enough to learn the more mundane details like reviewing expenses or filing your own taxes?
I know there are attempts, like showing those log graphs that try to impress upon young minds the long-term value of compound interest. I'm sure those help a few people, but I do wonder if there might be other more impactful concepts.
Personally, I get a great deal of satisfaction out of things like efficiency, self-reliance, and so on, but I don't know if valuing those things can be taught, or just develops organically. Regardless, I think you always need to impress upon students the motivations for their decision-making and try to help them care. The rest can come later.