Addition

Math-O (choose addition) - http://www.aplusmath.com/games/matho/Matho.html

That's a Fact! (choose addition) - http://www.harcourtschool.com/activity/thats_a_fact/english_4_6.html

Fact Monster Addition Flashcards - http://www.factmonster.com/math/flashcards.html

Fruit Splat Addition - http://www.sheppardsoftware.com/mathgames/fruitshoot/fruitshoot_addition.htm

Penguin Party Addition - http://www.sheppardsoftware.com/mathgames/popup/popup_addition.htm

Balloon Pop Addition - http://www.sheppardsoftware.com/mathgames/numberballoons/NumberBalloons_add_level1.htm

Matching Mania Addition - http://www.sheppardsoftware.com/mathgames/matching/matching_addition.htm

Bubble Math Fun (choose addition) - http://www.sheppardsoftware.com/mathgames/bubblefun/bubblefunmathbasics.htm

Subtraction

Math-O (choose subtraction) - http://www.aplusmath.com/games/matho/Matho.html

That's a Fact! (choose subtraction) - http://www.harcourtschool.com/activity/thats_a_fact/english_4_6.html

Fact Monster Subtraction Flashcards (choose subtraction) - http://www.factmonster.com/math/flashcards.html

Fruit Splat Subtraction - http://www.sheppardsoftware.com/mathgames/fruitshoot/fruitshoot_subtraction.htm

Pearl Search Subtraction - http://www.sheppardsoftware.com/mathgames/popup/popup_subtraction.htm

Matching Mania Subtraction - http://www.sheppardsoftware.com/mathgames/matching/matching_subtraction.htm

Bubble Math Fun (choose subtraction) - http://www.sheppardsoftware.com/mathgames/bubblefun/bubblefunmathbasics.htm