Hypothetical Learning Trajectory (HLT) Based on STEM-Ethnomathematics Puru Timbu to Improve Elementary School Students’ Mathematical Communication Skills. JUPE : Jurnal Pendidikan Mandala, [S. l.], v. 11, n. 2, p. 406–416, 2026. DOI: 10.58258/zts4w643. Disponível em: https://ejournal.mandalanursa.org/index.php/JUPE/article/view/10848. Acesso em: 28 jun. 2026.