Conventional teacher-led instruction remains dominant in most elementary mathematics classrooms in. Under such instruction, the teacher can rarely take care of all students. In that sense, according to the study of Yeh, C. et.al conducted in Taiwan, majority of the students may continue to left behind because of the difficulty of mathematics nature and somewhat student may lost their interest in the process of learning (2019). In that sense, it indicate that there is need for change and improvement. Thus, how to enhance students' mathematics achievement and interest are two major problems, especially for those low-achieving students. In that sense, curriculum change may benefit the students and guide them for better understanding of the subject mathematics. Therefore, this study aim to review and to know the significant objects of curriculum change in students performance in mathematics subject of 5th Grade. Explanation for step 1 2] Null Hypothesis: 1 = 2 The mean performance of students before and after curriculum change is the same Alternative Hypothesis: 1 2 The mean performance of students before and after curriculum change is the different [3] The type of data needed for this is a combination of qualitative and quantitative type of data. We need