Use this link to practice building equations with Cuisenaire Rods:
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