This study proposes the creation and use of the Design methodology on Educational Web Applications for the Field of Mathematics (DAECM) to build the web application on depreciation. The objective of this mixed research is to analyze the perceptions of the students about the use of this technological tool. The participants are 25 students who took the Information and Communication Technologies course at the National Autonomous University of Mexico during the 2023-2 school year. The DAECM methodology facilitated the construction of the educational web application on depreciation through the stages Analysis of the mathematical educational context, Analysis of web programming languages, Content design, Aesthetics and Evaluation. The results of this mixed research indicate that the educational web application is useful, facilitates the personalization of learning through simulators, favors the creation of a pleasant virtual environment, allows the education during the COVID-19 post-pandemic and encourages the learning of the math. This study recommends the incorporation of technological tools such as web applications because teachers can create new virtual spaces that help the students during the learning process. In conclusion, educators can use the DAECM methodology to update educational practices and innovate the course activities through the planning and construction of web applications.