Science Challenge #12 Question 3. Our normal numbering system is a decimal system (0-9). Computers do not have ten fingers. They are basically operated on the basis of on/off switches that are most appropriately described by what numbering system? Answer: The Binary system which consists only of ones and zeros. In Binary the number "2" looks like this "10" and "4" looks like this "100" Correct answer received from: Chris Grizzel, Kathi Burroughs, Shauna, Jason Coffer, Peter and Merridy Hance, Jennifer LeBlanc and Geoff Anderson, Nathan Groff