Math is Fun!
http://mathisfun.com/games/math-trainer-multiple.html  

Multiplication
http://www.multplication.com 

Math practice
http://www.apples4theteacher.com/math/html 

Adding and Subtracting Integers
http://www.math-play.com/integers-game.html

Math Challenge site for families http://www.figurethis.org/fc/family_corner.htm Math manipulative

National Library of Virtual Manipulatives
http://nlvm.usu.edu/ 

Interactive Pattern Blocks
http://ejad.best.vwh.net/java/patterns/patterns_j.shtml

Math Arcade on Funbrain http://www.funbrain.com/brain/MathBrain/MathBrain.html