This study developed and validated a web-based application in Mathematics in the Modern World (MMW) through the research and development approach. The topics included in the web application (IMath) were all the Learning Competencies of MMW based on the Curriculum Guide prescribed by CHED Memorandum Order No. 75 Series of 2017. The program of the web methods followed the Python Programming Language and Django Python Framework for Web Development. The study used different stages, namely: determining the lessons/topics, crafting the modules and activities, developing a web application, and web application testing. The web [Math was validated by 3 ICT experts using the ISO/IEC 25010 Standard Evaluation Sheet for Web Application. Results showed that all the criteria were met on the performance, ease of use, maintainability, portability, reliability, compatibility, functionality, and security of the IMath web application. Regarding the validation of [Math in terms of content, design/format, and pedagogy, the Evaluation Rating Sheet for DE & ODeL Modules was used by the 3 Mathematics experts. The results also showed that all the criteria were met after minor revision. Based on the validation, [Math web application lessons and activities can be used as supplementary instructional material in MMW. Keywords: math, web application, innovation, education, technology, ISO.