Grade 1 use group-work to describe the properties of a rectangle

The best mentoring moment is when I was observing  a Maths lesson, which involved an introduction to the rectangle. Students sat in groups of four. Each learner was given a piece of a rectangle (geo-shapes).  They had to share with one another the properties of the rectangle that they had. After sharing with one another feedback was given by each group, and as a result they all participated in describing the properties of the rectangle.This was the best mentoring moment for me because it was fascinating to see Grade 1 learners engaging in group work / discussions and giving feedback.