These lectures and accompanying worksheet introduce some basic algebraic problems.

https://web.archive.org/web/20181104213724/https://www.hsorkin.com/Algebra/Videos/Supp2_Lecture1/Supp_Lecture1_controller.swf

https://web.archive.org/web/20181104213823/https://www.hsorkin.com/Algebra/Videos/Supp2_Lecture2/Supp2_Lecture2_controller.swf

https://web.archive.org/web/20181104213910/https://www.hsorkin.com/Algebra/Videos/Supp2_Lecture3/Supp2_Lecture3_controller.swf

https://web.archive.org/web/20181104213959/https://www.hsorkin.com/Algebra/Videos/Consecutive_Integers/Consecutive_Integers_controller.swf