http://clic.xtec.cat/db/jclicApplet.jsp?project=http://clic.xtec.cat/projects/zatiki/jclic/zatiki.jclic.zip&lang=eu&title=Zatikiak+%28fracciones%29
http://nlvm.usu.edu/es/nav/frames_asid_106_g_4_t_1.html
http://nlvm.usu.edu/es/nav/frames_asid_105_g_4_t_1.html
http://clic.xtec.cat/db/jclicApplet.jsp?project=http://clic.xtec.cat/projects/zatikiga/jclic/zatikiga.jclic.zip&lang=eu&title=Fracciones,+m%FAltiplos+y+divisores
http://clic.xtec.cat/db/jclicApplet.jsp?project=http://clic.xtec.cat/projects/intereus/jclic/menu.jclic.zip&lang=eu&title=Actividades+de+matemticas+del+grupo+Interface
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