Check out these websites if you need assistance when helping your child with their homework.
Khan Academy- http://www.khanacademy.org/
This site is especially helpful with math, but also covers other topics as well
Qwiki ALPHA- http://www.qwiki.com/
All you do is enter a topic, “qwiki knows millions of things”
This is a sampling of resources available to help students.I hope this is helpful for you.