Tio Heriyana, Uba Umbara, Evan Farhan Wahyu Puadi. Didactical design research on mathematical sequence material in vocational high schools for job preparation. J. Elemen [Internet]. 2025 May 29 [cited 2025 Jul. 14];11(2):277-96. Available from: https://e-journal.hamzanwadi.ac.id/index.php/jel/article/view/27753