Math MovesU seems to be a great site for 5th, 6th and maybe a bit beyond. You can register on the site to be able to keep track of points earned but unlike other sites registration isn’t necessary to be able to visit this site. It looks to be a site that could be used with the whole class on an interactive board and woud keep attention but could also be used on individual computers. Once you choose a character and enter there are games, facts, quizzes, polls that you can try. I really want to explore this site more when I have time because I visited and tried only a couple of different places. It looks good to me!