It seems you are looking for teaching materials or a “long paper” (likely meaning an in-depth worksheet or learning unit) for 5th grade primary school mathematics, specifically from the Istituto Comprensivo Lannaronca (or a teacher/resource connected to that name).
While the original site remains a primary reference, some users have reported difficulties accessing certain sections due to its older format. The teacher is currently working on modernizing the site to make it more mobile-friendly. If you encounter broken links, alternative comprehensive Grade 5 materials can be found on sites like PianetaBambini specific exercises matematica classe quinta scuola primaria lannaronca link
To find a specific worksheet, you can browse the Official Index of Schede Didattiche or check for updates on the Lannaronca Facebook Page. It seems you are looking for teaching materials
In questo contesto, trovare risorse didattiche efficaci è essenziale per genitori, insegnanti e studenti. Ed è proprio qui che entra in gioco un nome molto noto nel panorama della didattica digitale italiana: Lannaronca. While the original site remains a primary reference,
Search on Google (or another search engine) with the exact keywords:
"Lannaronca matematica classe quinta"
or
"Lannaronca scuola primaria quinta matematica"