Third graders? Nothing bad about teaching young students about Bitcoin, but if I remember it correctly the lessons when I was a third grader were simply multiplication and division, decimals, and a bit of fractions.
Did you really speak a lot about Bitcoin to these young children? I'm curious what you taught them.
I remember in 3rd grade, we had just learned the multiplication table and started learning simple calculations. I would be more curious than you, what do those kids know about bitcoin? Or do they only see the image of bitcoin when we are using the iPad to watch cartoons or play games? My 5 year old son also knows bitcoin every time I give them a physical bitcoin to play with, but other than that they know nothing else.
And I also want to ask OP, what do you teach kids about bitcoin, while they don't even know how to add, subtract, multiply, and divide?