Use this link to practice building equations with Cuisenaire Rods:
http://nrich.maths.org/content/id/4348/cuisenaire.swf
http://nrich.maths.org/content/id/4348/cuisenaire.swf
Abcya.com
www.abcya.com
Starfall.com
www.starfall.com
Brainpopjr.com
www.brainpopjr.com
Fossweb.com
www.fossweb.com