Play, have fun and practice your subtraction here. :)

http://www.amblesideprimary.com/ambleweb/mentalmaths/subtractiontest.html

http://www.oswego.org/ocsd-web/games/SpeedGrid/Subtraction/urikasub1res.html

http://www.bbc.co.uk/schools/laac/numbers/ch2.shtml

http://www.scweb4free.com/subtraction030.htm

http://www.oswego.org/ocsd-web/games/Mathmagician/mathssub.html