Characterisation of the learning trajectory of children aged six to eight years old when acquiring the notion of length measurement

International audienceThe goal of this study is to identify the learning trajectories that students aged 6 to 8 years old follow during the construction of the notion of length measurement. An instrument based on the construct of a hypothetical learning trajectory was designed to ascertain the different levels of understanding of this notion among the children. The implementation of the said instrument and the subsequent analysis are described. The results obtained from the study were used to situate the children on their predominant learning trajectory level. At the same time, the results reveal what mathematical topics teachers should focus on to ensure that children can move on to the next level of their trajectory and thus consolidate their learning