Video here: http://www97.intel.com/en/TheJourneyInside/ExploreTheCurriculum/EC_DigitalInformation/DILesson2/
So how do you count in a binary system? How do you represent numbers like 103? In decimal (base 10) numbers, you have a 1s place, a 10s place, a 100s place, and so on, to represent value. The binary system has places or columns too. Only because you're in base 2, instead of each place being 10 times greater than the place before it, each place is only double (2 times) the one before it. video here: http://www97.intel.com/en/TheJourneyInside/ExploreTheCurriculum/EC_DigitalInformation/DILesson4