well kids like to play, so something that can bring together bitcoin and gaming
like puzzle that when solved reveal a private key for example
it is important that kids start to learn early some basic economy, at least something about income and expenditure
i heard about a new law for some countries that will make it possible(to teach them basic economy) in schools
there are some kids that they dont get it easily. they cant understand what are you saying so be specific. when you teach them show them in computer or in your moble so that they can understood easier. teach them the basic way to learn and to start bitcoin to manage.