Teach R Kids Math http://www.teachrkids.com/
Fact Monster http://www.factmonster.com/
Math Fact Cafe http://www.mathfactcafe.com/
Polygons! http://www.mathcats.com/explore/polygonplayground.html
Math Skills http://mathisfun.com/
Math Playground http://www.mathplayground.com/wordproblems.html
Multiplication Games http://www.multiplication.com/interactive_games.htm
Geo-boards! http://nlvm.usu.edu/en/applets/controller/query/query.htm?qt=geoboard
Fish Tales Measurement Game http://www.compasslearningodyssey.com/sample_act/math1_2/01MADB03a-fish_tails_v2.swf
Fraction Games http://www.gamequarium.com/fractions.html
Decimal Games http://www.decimalsquares.com/dsGames/
How to Read a Ruler http://www.rsinnovative.com/rulergame/index.html
Flips, Slides, Rotations ttp://www.eduplace.com/kids/mw/swfs/robopacker_grade3_t.html
Create a Graph http://nces.ed.gov/nceskids/createagraph/
Counting Money http://www.apples4theteacher.com/java/counting/money.html
Spooky Halloween Math Games http://www.apples4theteacher.com/holidays/halloween/math-games/
Addition Games http://www.fun4thebrain.com/addition.html
Subtraction Games http://www.fun4thebrain.com/subtraction.html