Μαθαίνω τους τριψήφιους αριθμούς.

http://www.ictgames.com/sharkNumbers/sharkNumbers_v5.html

http://www.ictgames.com/arrowCards_revised_v4.html

http://www.ictgames.com/abacusInteger.html

http://www.toonuniversity.com/flash.asp?err=509&engine=9

http://www.oswego.org/ocsd-web/games/spookyseq/spookyseq3.html