1º de primaria:

http://clic.xtec.cat/db/jclicApplet.jsp?project=http://clic.xtec.cat/projects/numerac/jclic/numerac.jclic.zip&lang=es

https://clic.xtec.cat/projects/calnuca/jclic.js/index.html

http://www.chiscos.net/repolim/lim/letra_ll/letra_ll.html