deberes sumas de dos cifras
http://www.actiludis.com/wp-content/uploads/2012/05/Sumas-y-restas-09.pdf
http://www.actiludis.com/wp-content/uploads/2008/08/03-Sumas-llevando-y-Sumas-y-Restas-sin-llevar.pdf
http://www.actiludis.com/wp-content/uploads/2012/05/Sumas-y-restas-09.pdf
http://www.actiludis.com/wp-content/uploads/2008/08/03-Sumas-llevando-y-Sumas-y-Restas-sin-llevar.pdf
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