Four links specifically for students doing the CFIE course on Innovative Methodology:

https://www.youtube.com/watch?v=DnhJ1UGw7Kg&feature=youtu.be&noredirect=1

https://www.youtube.com/watch?v=lqLZcZVdDY8

http://studyjams.scholastic.com/studyjams/jams/math/multiplication-division/divisibility-rules.htm