This paper mentions our research findings regarding the use of real-world problems to develop students' mathematical modeling abilities. We conducted a controlled experiment at Phu Huu High School in Hau Giang province, using class 12A1 as the control group and class 12A2 as the experimental group (school year 2020-2021). The purpose of our research is to address two questions: how to design real-world problems that will help students develop their mathematical modeling capacity; and what effect will using this real-world problem have. As a result, we indicated how to use real-world problems to develop students' mathematical modeling competence and demonstrated experimentally that the experimental class's learning results were superior to those of the control class taught in the traditional manner. Based on the research findings, we will continue to conduct research on other topics in high school mathematics in order to contribute to improving teaching effectiveness.