HORIZON: Indonesian Electronic Journal of Multidiciplinary is a fully refereed (double-blind peer review) and an open-access online journal for academics, researchers, graduate students, early-career researchers and students, published by Lembaga Intelektual Muda (LIM) Maluku. HIEJM is a periodical publication (two times a year, in March and September) with the primary objective to disseminate scientific articles in the fields of mathematics education. HIEJM is indexed by Directory of Open Access Journals, Indonesian Scientific Journal Database, Google Scholar, and several others including Crossref, Sinta, Road, OneSearch, Garuda, PKP Index and WorldCat.