Enlaces
[1] https://www.rmm.cl/portales/222/articulos/restas-dos-cifras
[2] http://r.search.yahoo.com/_ylt=A0geKWFBQ4Nbsl0ARAkPxQt.;_ylu=X3oDMTByOHZyb21tBGNvbG8DYmYxBHBvcwMxBHZ0aWQDBHNlYwNzcg--/RV=2/RE=1535357889/RO=10/RU=http%3a%2f%2folimpia-primerciclo.blogspot.com%2f2011%2f10%2ffichas-de-restas.html/RK=2/RS=6Hy56iJnxI.G4oP.4aEznlIZHfg-
[3] http://orientacionandujar.files.wordpress.com/2010/01/restas-de-dos-cifras-con-y-sin-llevada-1.pdf
[4] http://orientacionandujar.files.wordpress.com/2010/01/restas-de-dos-cifras-con-y-sin-llevada-2.pdf
[5] http://orientacionandujar.files.wordpress.com/2010/01/restas-de-dos-cifras-con-y-sin-llevada-3.pdf
[6] http://orientacionandujar.files.wordpress.com/2010/01/restas-de-dos-cifras-con-y-sin-llevada-4.pdf
[7] http://orientacionandujar.files.wordpress.com/2010/01/restas-de-dos-cifras-con-y-sin-llevada-5.pdf