All lessons are available free of charge at http://www.computerscienceforeveryone.com -- In this lesson you will learn how to write binary numbers, how to convert binary numbers to decimal (base 10), and how to add binary numbers together. If you get stuck, feel free to ask questions below. To watch a playlist of all videos in this course: http://www.youtube.com/playlist?list=PL76809ED684A081F3&feature=view_all