We have done Xtramath on and off for a short time. We did it for about a week and a half daily, and then we stopped – but my daughter went in and did it on her own today.
I don’t know if this is true of kids in general – but my kids scores seem to be dropping in it…. so I’m no longer requiring it…. But it was really good for me to see which ones my kids are struggling with. I think my kids just on’t work well with that type of thing or something…
Khan Academy is another good free resource for math (we aren’t using it either though…)