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http://www.softschools.com/coloring_games/coloring_umbrellaadd.jsp
http://www.softschools.com/math/games/mad_minute_math/
http://www.softschools.com/math/games/fishing_add.jsp
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http://www.fun4thebrain.com/addition/alienmunchadd.html
http://www.oswego.org/ocsd-web/games/SumSense/sumsub.html
http://www.arcademicskillbuilders.com/games/alien/alien.html
http://www.funbrain.com/cgi-bin/mb.cgi?A1=start2&A2=0&ALG=0&INSTRUCTS=1
http://mrnussbaum.com/mayan-math/
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http://resources.oswego.org/games/SumSense/sumadd.html
http://www.aplusmath.com/cgi-bin/games/subpicture
http://www.mothmatic.com/math/subtraction_1.htm
http://www.thegreatmartinicompany.com/Kids-Math/kid-sign.html
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http://www.fun4thebrain.com/subtraction/flyingsub.html
http://www.kidsnumbers.com/add_it_up.php
http://www.novelgames.com/flashgames/game.php?id=186
http://www.fun4thebrain.com/subtraction/deepdivesub.html
http://www.amblesideprimary.com/ambleweb/mentalmaths/subtractiontest.html
http://www.fun4thebrain.com/subtraction/luckysub.html
http://oswego.org/ocsd-web/games/mathmagician/maths1.html
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http://www.abcya.com/subtraction_game.htm
http://www.oswego.org/ocsd-web/games/Ghostblasters3/ghostsub2.html
http://www.mothmatic.com/math/subtraction_3.htm
http://www.ictgames.com/spacejumps.html
http://www.carstensstudios.com/mathdoodles/sumsstacker.html
http://www.netrover.com/~kingskid/double.htm
