This came highly recommended from Peggy Orenstein, a well-know author.
Daisy (my daughter) and I are taking a 6-part online course by math guru Jo Boaler and it is truly life-changing. It is not only changing our relationship to math but to learning as a whole. Only 10-20 minutes per lesson, you can do it any time between now and December and it's FREE. I HIGHLY HIGHLY HIGHLY recommend it for students of any age and their parents!
I haven't tried this yet but plan on doing together with my 11-year old daughter this summer.