I think the best way to teach kids about bitcoins is to introduce them to the games that pays in bitcoins as kids are very much addicted to games so in that case they can also have fun of playing games and at the same time they will start earning bitcoins.
Teaching them on how to earn bitcoins thru video games on your cellphone or smartphone will not help them in their studies or even improving their skills. It will just make them a very lazy person because they will get addicted to the game and they will abandon social life and that is not a good practice to kids, so no to young kids that will do bitcoin.