<a href="http://nlvm.usu.edu/en/NAV/frames_asid_201_g_4_t_2.html?open=instructions&amp;from=category_g_4_t_2.html">Algebra Balance</a>

Practice your Math Addition Facts online

<a href="http://www.arcademicskillbuilders.com/games/alien/alien.html">Alien Invader Math Game!</a>

Play Against Others with <a href="http://members.learningplanet.com/act/mayhem/free.asp">Math Mayhem</a>

Some challenging games:

<a href="http://nlvm.usu.edu/en/nav/frames_asid_112_g_2_t_1.html?open=activities&amp;from=grade_g_2.html">Try the Tangrams</a>

<a href="http://nlvm.usu.edu/en/nav/frames_asid_326_g_2_t_1.html?from=grade_g_2.html">Try Diffy</a>