ZULKIFLI. Effects Of Youtube Tutorial On Mental Computation Competency Of Pre-Service Teachers . Jurnal Serambi Ilmu, [S. l.], v. 23, n. 1, p. 48–58, 2024. DOI: 10.32672/jsi.v23i1.951. Disponível em: https://jurnal.serambimekkah.ac.id/index.php/serambi-ilmu/article/view/951. Acesso em: 2 dec. 2025.