Factor Game http://illuminations.nctm.org/tools/tool_detail.aspx?id=12
Lemonade Stand How much profit can you make in 30 days? http://4webgames.com/lemonade/singleplayer/play.php
tetris (using factors) You will have to choose math game link and then choose the factortis game http://hotmath.com/games.html
Grand-slam http://www.mathplayground.com/GSMbegin.html
fact practice http://www.mathplayground.com/flashcards.html
mastermind http://nlvm.usu.edu/en/nav/frames_asid_288_g_1_t_1.html?open=instructions
2004 TAKS Release Test http://ritter.tea.state.tx.us/student.assessment/resources/online/2004/grade6/math.htm