1. Come up with a new numeric system -other than the well used ones Bin, Dec, Oct & Hex- Tell us how many symbols are there in your system, list the symbols and convert 82516 from decimal to that system. Don't be afraid to use a system larger than 16:-) 2. Check if your friend's conversion is correct by replying to a class mate's post and showing the conversion back to decimal. Or post a good quality comment about the video and/or the article with the links posted above