This issue of the MagPi magazine has a great set of intro-to-programming articles that are short and sweet. To boot these folks have made this magazine available for Download. Its a tremendous resource. When teaching kids, having something that gets it done fast is important, and they’ve done a great job with these articles.
To boot, they have a couple of great projects in this one too – that is much less notable as they’ve done great work on that front for all of their issues but this coupled with the training articles is just great.
Check them out, and consider getting a subscription. They aren’t cheap, but they provide many perks with their issues.