I talk to my kids (tween / teen) about money, and numbers. I am financially reasonably secure, and numerate. My kids are both interested in numbers and good at maths. I imagine this makes talking about money matters much, much easier than it could otherwise be.
My kids have known since being really young that, as a family, we have enough money for the things we need, and money for some, but not all, of the things we'd like. They know how much our weekly food shop costs. They know how much an average UK salary is. They know a bit about the minimum wage. They have some awareness of what house prices and rents are locally, and how they compare with average and minimum wages. They know a bit about universal credit and state pensions, disability benefits, etc. I've shown them how compounding works for positive and negative effects. They know what we earn. I've talked the older one through a pension statement and forecast. They know a bit about progressive and regressive taxation. They're fascinated by the budget. They're also fascinated by gambling.
The older one has been very interested in learning about how to adult when they leave home, different options for housing, how to earn money (find a job, get a job, set up a business), all that kind of stuff. They know some jobs pay more, others pay less.
We seem to have a lot of these sorts of conversations in the car. It seems a good environment for many discussions that might otherwise be harder.