Click the green flag. Follow the prompts on screen. Number systems besides base 10 (the one we use) work as follows: The first digit from the right is the ones place. The second is the x's place, where x is the base. For example, the number 45 in base 6 is 4*6 + 5 = 29 in base 10. Then the digit after that is the x^2's, then the x^3's, etc. Number systems beyond base 10 use letters past the 9; A is 10, B is 11, etc. until Z, which is 35.
@alexphan gave me the idea. Check out his number converter with a beautiful interface! http://scratch.mit.edu/projects/24404208/
