How can the concept of perimeter and area be developed in 7th grade?

Abstract

Learning and teaching measurement have a central role in school geometry. In this study, we are focusing on two physical quantities: perimeter (length) and area. We compare the results of two surveys. The first was written at the beginning of the 7th school year, in September, while completed the second one in December of the same year, two weeks after the geometric measurement topic. On the one hand, we were curious about the students' previous knowledge before receiving the new learning material related to the topic under study. On the other hand, we wanted to know how to change students' understanding after focusing on the concepts studied for a few weeks. The characteristics of the concept formation process were also of interest to us.