This article aims to describe the mathematical identity of elementary school students during studying mathematics. When studying mathematics, the students often face difficulties in understanding the concepts which results the decrease in their learning motivation. It will lead to the lack of development of their mathematical identity. The students who are able to develop their mathematical identity well are more likely to succeed in learning mathematics. A qualitative approach was employed to trace the students' mathematical identity. Questions and interviews were used to collect the data. The findings indicated during participating in the group learning activities, the students were able to increase their motivation. Therefore, it can improve their mathematical identity.