Here some excellent instructional tools for you. Lots of free movies to explain all kinds of skills.

1. Brain Pop only offers a few free videos. Otherwise, there is a subscription.

http://www.brainpop.com/

2. Movies for Earth Science

http://glencoe.mcgraw-hill.com/sites/0078617006/student_view0/brainpop_movies.html

3. Movies for Life Science

http://highered.mcgraw-hill.com/sites/0078617022/student_view0/brainpop_movies.html

4. Algebra Movies

http://www.glencoe.com/sec/math/algebra/algebra1/algebra1_05/brainpops/index.php4/in

5. Pre-Algebra Movies

http://www.glencoe.com/sec/math/prealg/prealg05/brainpops/index.php4/in