http://www.ngfl-cymru.org.uk/vtc/phase4_20030829/Mathematics/Keystage2/Numbers/Anintroductiont/Introduction/default.htm
http://www.bbc.co.uk/education/mathsfile/shockwave/games/laddergame.html
http://www.learningplanet.com/sam/ff/index.asp
http://www.bbc.co.uk/skillswise/numbers/fractiondecimalpercentage/decimals/introductiontodecimals/activity.shtml
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