SIGMA is an academic open-access journal which has been established for the dissemination of state-of-the-art knowledge in the field of mathematics and mathematics education. This journal published in Mathematics Education Department at Bondowoso University. It is published twice in a year (February and August). The SIGMA welcomes manuscripts resulted by researchers, scholars, teachers, and professionals from a research project in the scope of Pure Mathematics, Computing Mathematics, Statistics, Mathematics Learning, Evaluation and Assessment in Mathematics Learning, STEAM, Ethnomathematics, ICT in Mathematics Education, Design / Development Research in Mathematics Education and sciences. All submitted manuscripts will be initially reviewed by editors to ensure the quality of the published manuscripts in the journal. The manuscripts should be original, unpublished, and not in consideration for publication elsewhere at the time of submission to the SIGMA.