Search and Find Games (link requested by Salsabeel)
http://www.highlightskids.com/GamesandGiggles/HiddenPics/HIddenPixFlashObjects/h8hpiArchive.asp
Subtraction
http://www.classbrain.com/artgames/publish/regrouping_math_game.shtml
http://www.helpingwithmath.com/resources/games/magnet_addsubsigns_to19/AddSubSignsTo19.html
http://www.fuelthebrain.com/Game/play.php?ID=69
http://www.fun4thebrain.com/subtraction/monstersSub.html
http://www.coolmath-games.com/numbermonster/index.html
http://www.mrnussbaum.com/mayan-math/index.html
Addition
http://www.softschools.com/math/games/fishing_add.jsp
http://www.playkidsgames.com/mathGames.htm
http://www.prongo.com/math/addition.html
http://www.scweb4free.com/scooby-doo1.htm
http://www.scweb4free.com/elemad.html
http://www.scweb4free.com/elemad.html
http://www.mymathgames.com/addition/ag/mickeymouseaddition.htm
http://www.mymathgames.com/monkeyaddition.htm
http://www.mymathgames.com/addition/EdEddnEddy/
http://www.mymathgames.com/addition/tom&jerry/
http://www.mymathgames.com/addition/ninjaturtles/index.htm
Classifying Animals
http://www.sciencenetlinks.com/interactives/class.html
http://www.bbc.co.uk/schools/scienceclips/ages/6_7/variation.shtml
http://www.kidscom.com/games/animal/animal.html
http://www.switcheroozoo.com/games/pleasedofeedtheanimals.htm
http://www.switcheroozoo.com/games/scavengers_hunt1.htm
http://teacher.scholastic.com/activities/explorations/bug/level1/interactive.htm
http://www.on.ec.gc.ca/greatlakeskids/habitatfinal.html
Healthy Eating
http://www.glasgows.co.uk/fsa_interactives/PltLoad.swf
http://archive.food.gov.uk/breakfastgame/healthybreaky28nov08.swf
http://www.food.gov.uk/multimedia/flash/sugarbeatprincess.swf
http://www.food.gov.uk/multimedia/flash/Alisha_and_Ronnie_e.swf
http://www.food.gov.uk/multimedia/flash/unmuddle_the_meals_intro.swf
http://www.gladiator.org.uk/game/index.html
http://teamnutrition.usda.gov/Resources/game/BlastOff_Game.html
Simple Machines
http://www.edheads.org/activities/simple-machines/
http://pbskids.org/zoom/games/goldburgertogo/rubegame.html
http://www.harcourtschool.com/activity/machines/simple_machines.htm
http://www.mos.org/sln/Leonardo/three/three.html
http://www.cosi.org/files/Flash/simpMach/sm1.swf\
Mapping
http://www.sheppardsoftware.com/World_Continents.htm
2D Shapes
http://www.crickweb.co.uk/assets/resources/flash.php?&file=quad
http://www.bbc.co.uk/schools/ks2bitesize/maths/shape_space/shapes/play_popup.shtml
http://www.bbc.co.uk/schools/ks1bitesize/numeracy/shapes/fs.shtml
http://www.ngfl-cymru.org.uk/vtc/ngfl/maths/maerdy_2d/e_index.html
http://www.interactivestuff.org/match/maker.phtml?featured=1&id=14
http://pbskids.org/cyberchase/games/area/tangram.html
http://www.math-play.com/basic-shapes-game.html
Additions and Subtraction
http://funschool.kaboose.com/formula-fusion/games/game_paint_brush_math.html
http://funschool.kaboose.com/formula-fusion/games/game_go-go_go-karts.html
Spelling
http://puzzles.sympatico.msn.ca/chicktionary/index.html
Air and Water
http://www.epa.gov/ogwdw000/kids/flash/flash_watercycle.html
http://www.epa.gov/ogwdw000/kids/flash/flash_wordscramble.html
http://apps.southeastwater.com.au/games/education_kidsroom_wcactivity.asp
Data Management
http://www.beaconlearningcenter.com/WebLessons/AllTheParts/default.htm#page2
http://pbskids.org/cyberchase/games/bargraphs/bargraphs.html
http://www.beaconlearningcenter.com/WebLessons/HowItAllStacksUp/default.htm#page2
http://www.beaconlearningcenter.com/WebLessons/KidsHavePets/default.htm#page4
http://quizzer.eduplace.com/cgihttp://dumontiermathleap.com/WebMaths/EnglishMaths/EnglishHotPot/04_06_Pictographs/Pictographs02_english.htm
http://nces.ed.gov/nceskids/createAgraph/
http://www.amblesideprimary.com/ambleweb/mentalmaths/grapher.html
Patterning
http://pbskids.org/cyberchase/games/patterns/patterns.html
http://math.rice.edu/%7elanius/counting/pattern2.html
http://www.primarygames.com/patterns/question1.htm
http://www.learner.org/teacherslab/math/patterns/people/start.html
http://www.dositey.com/games/patterngame.htm
http://library.thinkquest.org/CR0213184/Mystery.htm
Skip Counting
http://www.ictgames.com/fishy2s.html
http://www.harcourtschool.com/activity/connect_by_5/
http://www.harcourtschool.com/activity/connect_the_dots/
http://www.harcourtschool.com/activity/number_patterns5_10/
http://members.learningplanet.com/act/count/free.asp
http://www.cleverisland.com/teachers/counting/story/6.asp
Hundreds Chart Patterns
http://www.harcourtschool.com/activity/number_patterns5_10/
Base Ten Concepts
http://www.learningbox.com/Base10/BaseTen.html