Jack Buffington have recently started this very pedagogic video-series that covers the mathematics and logic behind electronics.<p>He starts out easy by introducing binary, decimal and hexadecimal system. He then explain how to add and subtract in binary form, then multiplication, division etc.<p>Each episode covers one new element in digital logic, and he's merging the episodes together by using some methods learned in previous episode.<p>It's quite easy to follow along, and fun to learn some of the mathematical theory behind digital logic.