Using practical problems in teaching in high schools is meaningful in linking theoretical and practical knowledge, creating problematic situations in teaching, and thereby contributing to the development of qualities and competencies for students, especially the competency of applying knowledge and skills learned. In this article, through the literature review, we have systematized the theoretical basis for practical problems and teaching through practical problems
proposed the design process of practical problems
built and perfected a system of practical problems under the topic of "Metabolism in organisms" in Biology grade 11
and used practical problems to design lessons to practice pedagogy at Van Hien High School (Hanoi) to develop students' competency to apply knowledge and skills learned. Experimental results show the effectiveness and feasibility of using practical problems to develop students’ competency in applying learned knowledge and skills.