Extended abstract: A didactic path for age 5-8 on the concept of extensive quantityusing a story as a cognitive tool

The main goal of this didactical path is to ensure that pupilsof ages 5–8 achieve a good mastery of the concepts ofextensive quantity. How can the concept of quantity beexplored starting from an early age? Which cognitive toolscan be supplied both to teacher and pupils to help them inrecognising and setting in the right place the emerging ideasrelated with this concept?From the teaching side, we suggest the use of a didacticalpath, which represents a methodological framework in whichchildren and teacher can work together.