http://www.woodlands-junior.kent.sch.uk/maths/interactive/numbers.htm

http://www.mathsisfun.com/numberpatterns.html

http://www.maths.com/numbers.square.htm

http://www.woodlands-junior.kent.sch.uk/maths/interactive/index.htm

http://www.bbc.co.uk/schools/numbertime/games/mend.shtml

http://www.puzzlepixies.com/impossible/impossible/magic-square-4x4.html

http://www.cardinaleducation.co.uk/maths%20grids.htm

http://www.mathsisfun.com/games/number-square-puzzle.html

http://mathsblog.co.uk/tag/number-square/

http://www.ngfl-cymru.org.uk/eng/txt/vtc-home/vtc-ks3-home/vtc-ks3-maths(2)/vtc-ks3-maths-number/vtc-ks3-maths-number-patterns_and_relationships/number-square-number-patterns-and-relationships.htm

http://www.bbc.co.uk/schools/ks3bitesize/maths/algebra/number_patterns/revise1.shtml

http://www.craftpacks.co.uk/?page=main/browse&cid=4&scid=22

http://www.easycalculation.com/funny/shortcuts/square.php

http://mathforum.org/library/topics/number_sense/?keyid=30731635&start_at=201&num_to_see=50

http://www.easycalculation.com/numbers.php

http://www.oswego.org/ocsd-web/games/DogBone/gamebone.html

http://www.math.umbc.edu/~campbell/Math413Spr09/Notes/SumsPowers.html

http://www.mathsyear2000.org/explorer/patterns/

http://ngfl.northumberland.gov.uk/maths/number%20squares/1-100squ1but.html

http://www.metacafe.com/watch/454399/maths_magic_squares/