Interval: Indonesian Journal of Mathematical Education is a peer-reviewed open-access journal established to disseminate state-of-the-art knowledge in mathematics education. Editors will review all submitted manuscripts and then evaluate them by at least two international reviewers through the double-blind review. This is to ensure the quality of the published manuscripts in the journal. Interval: Indonesian Journal of Mathematical Education Journal welcomes high-quality manuscripts resulting from a research project in the scope of mathematics education