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Siahaan, F.A.S. and Michel, J. 2023. Development Of Hiro Card Media on Mathematics Lessons For Roman Numbers In Class Iv Sd Negeri Sempu 2 City Of Serang: Research and Development On Fourth Grade at SDN Sempu 2 Serang . Jurnal Gentala Pendidikan Dasar. 8, 1 (Jun. 2023), 1-13. DOI:https://doi.org/10.22437/gentala.v8i1.20611.