http://www.multiplication.com/games/play/quick-flash-ii
http://ascendmath.com/fcm/html5/
https://www.helpingwithmath.com/resources/games/mult_table2/matching.html
Penguin math game: http://www.sheppardsoftware.com/mathgames/popup/popup_addition.htm
Site with a number of good addition and subtraction games: http://www.kidsnumbers.com/
http://www.abcya.com/addition.htm
http://www.abcya.com/subtraction_game.htm
http://www.abcya.com/math_facts_game.htm