Development of Codular-Based Mathbox Media to Improve Students’ Self-assessment and Understanding of The Pythagorean Theorem

This study uses 'Matchbox' media which is focused and aims to improve students' self-assessment and understanding and is developed using the Codular website. The research method used is Research and Development (R&D) with the ADDIE model (Analysis, Design, Development, Implementation, Evaluation). The development of this learning media proved to be valid with an average percentage of 95.45% of the 'Very Good' Media Checker criteria as measured using the Guttmann scale. There was an 11.1% increase in the pre-test to posttest self-assessment scores which were measured using a Likert scale. The difference in the scores of students' understanding tests with the Paired T-test shows that the application of media affects students' understanding test scores. Based on the results obtained, it can be concluded that the designed Codular web-based Mathbox media is a valid medium and can improve students' self-assessment and understanding of the Pythagorean theorem.