here are some links that are helpful for homework and extra practice
Math and Reading Practice
IXL
-www.ixl.com
Learning Farm (also has Science practice)
-www.learningfarm.com
Accelerated Math 2.0
-www.hosted176.renlearn.com/198741
ABCya
-http://www.abcya.com/
Sheppard Software (also has Science and S.S. practice)
http://www.sheppardsoftware.com/