Hi alee,

We do a little afterschooling and I've been really impressed with the Real Science for Kids series. We've done chemistry and DD8 was really into it. DD5 loved it as well, but was a bit out of reach for her, it's meant for 4th/5th grade.
I also like Aleks for math. It starts at level 3, but depending on your child's math exposure you might start it at 6 or 7.

Neato