摘要：This study aim to improve the positive attitudes toward mathematics and learning motivation through Indonesia Realistic Mathematics Education (IRME) with portfolio assessment in mathematics learning. This was a collaborative classroom action research (CAR). The research collaborator was the Grade IV teacher as the action doer. The data were collected through students’ attitude scales, interviews, and observation. The instrument included students’ attitude scales, interview guided, and observation sheets. The data were qualitatively and quantitatively analyzed. The results of the study showed that the students’ positive attitudes toward mathematics and learning motivation improved after the learning actions using the IRME with portfolio assessment. The mean score before the act ions was 76.50, indicating a moderately positive criterion. In Cycle I, it improved to 81.50, indicating a positive criterion, and Cycle II it improved to 86.79, indicating a positive criterion. From the inter_x005f?view obtained information that the students who motivated to study harder was 7.14% in the pre?action, 50% in Cycle, I and improved to 92.86% in Cycle II.
其他摘要：Penelitian ini bertujuan untuk meningkatkan sikap positif terhadap matematika dan motivasi belajar siswa kelas melalui PMRI dengan asesmen portofolio. Penelitian ini adalah Penelitian Tindak an Kelas kolaboratif dengan guru kelas sebagai kolaborator pela
