DS5- Last week after less than five minutes instruction on the use of Roman Numerals, and having never seen them before (well he has prob noticed them as chapter headings or on a clock- but we have never talked about them) used them perfectly to build numbers as large as 9999. I was getting wrong answers then he'd explain to me how to do it right smile. we were doing 3rd grade on ixl.com so some were multiple choice, but many were type it out. No wrong answers! New motto:Five minutes to learn..a second to master;)