This is one of the BEST math sites I have found! I use it with my math intervention students. It gives very detailed data on each of the kids!! I have used it for a large portion of this school year! Best thing...IT IS FREE!
Link that follows leads to a brief article that describes the program. Did I forget to mention that this resource is free! http://myclasstech.com/2012/02/06/tenmarks-21st-century-math-instruction-has-arrived/
www.tenmarks.com- LOVE THIS SITE! Free website that lets you assign specific kids specific topics and assignments. They each get a login, can access it from computer lab or at home, and go at their own pace. It has videos and hints on the side to teach them, and you can look at their score report and progress from your login.