Educreations

This is an IOS app called Educreation.  It is essentially a WhiteBoard on the iPad that you can record on as you go through a lesson so the students can play it back as many times as they need.  I can see this being used in many different lessons including a flipped classroom and math.  Disclaimer: no mention was ever made that you had to be a perfect artist to use this.

<iframe width='480' height='300' src='https://www.educreations.com/lesson/embed/21061958/?ref=app' frameborder='0' allowfullscreen></iframe>

http://www.educreations.com/lesson/view/water-cycle/21061958/?ref=app