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All of the articles in this proceedings volume have been presented at the 1st International Conference on Demographics and Civil-Registration (INCODEC) 2021 during November 11-13, 2021 in Indonesia. These articles have been peer reviewed by the members of the Reviewer Committee and approved by the Editor-in-Chief, who affirms that this document is a truthful description of the conference's review process. D. Lukitasari-Editors-in-Chief of the 1 st International Conference on Demographics and Civil-Registration (InCodec) 2021.

This study aims to describe the increase of students' mathematical understanding ability in learning the two-variable linear equation system (SPLDV) and the two-variable linear inequality system (SPTLDV) with Android GeoGebra media reviewed by gender. This experimental quasi research is one group pretest postest design. The sample in this study was a class XI of 32 students with Purposive Random Sampling techniques. Data collection in this study uses an instrument for a mathematical understanding ability test in the form of a description. The results of the study can be concluded in the learning of Android GeoGebra, the mathematical understanding of male students is significantly different from the mathematical understanding of female students. It means that in learning the Android GeoGebra Improvement of the Mathematical Understanding Ability of Male Students is greater than female students. Thus it can be concluded that in the learning of Android GeoGebra, an increase in the mathematical understanding of male students is better than female students.

Promoting the Pancasila Students' Profiles through Mathematics Education in Schools: Ethnomathematics Roles.

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