"My 4th graders have been using the newly revamped Khan Academy website on our iPads since Mid-November. Things have been going great and I have seen a fantastic, better than average, increase in MAP Math scores from August to January.
I read a Tweet recently that mentioned an App called Front Row (or Front Row Ed Math). It is very similar to Khan in many ways but has some thing unique to it that I really like. Both Khan and Front Row are FREE and both give teachers access to "More Data About Their Students Than They Could Ever Use.""
Via John Evans