I had a math class with third graders of which we discussed money I told them about virtual and real money of which I was very shocked and happy that they had knowledge about Bitcoin.
However we ended the class after we had spoken alot about Bitcoin they were soo happy and loved the class also
Like wow being with the kids was a nice time for them and I to get to know Bitcoin better look forward to having a class with them next week
This may not be the response you may be looking for but in my own opinion, I think you should focus more on personal finance or financial literacy than on bitcoin a highly volatile and speculative asset. The subject of bitcoin should be mentioned to them in passing so that they at least have knowledge of what it is. It shouldn't be what you as the teacher should dwell on because they have really no use of it now. However, if you teach them about personal finance and financial literacy which is hardly taught both at home and in school, it will be the perfect intro to the world of cryptocurrency. Because you cannot talk about bitcoin without talking about several investment strategies, risk management, emotional intelligence with regards to finance, etc.