Math Games
Here are a variety of free sites to have your kids try out if they are into computer games. Most of these sites have great number sense activities as well as addition, and subtraction games.
http://www.mathplayground.com/
http://www.multiplication.com/games/addition-games
http://www.abcya.com/kindergarten_computers.htm
http://www.hoodamath.com/games/addition.html
http://www.sheppardsoftware.com/mathgames/popup/popup_addition.htm
http://www.coolmath-games.com/1-reading-spelling-games-01.html
Reading/ Blending Games and Activities
http://www.primarygames.com/reading.php
http://www.coolmath-games.com/1-reading-spelling-gam
http://www.learninggamesforkids.com/
http://www.abcya.com/kindergarten_computers.htm