I teach Computer Science to children in the Secondary School arena. When I do a lesson I always try to explain WHAT we are doing ahe WHY it is relevant to them. However, when it comes to couting systems I struggle. If you are a year 7 or 8 you cannot just say: "learn it because is it in the exam." It doesn't wash! Does anyone have any ideas? I am looking for a compelling reason to learn 010101010?