The tendency of modern education and teaching is that students should gain independency as much as possible through the process of acquiring knowledge. In addition to what is done, taught or clarified, modern theories of teaching give more importance to how it is done. The main objective of this study was to experimentally establish the effectiveness of learning through problem-solving in Serbian language grammar-teaching. The research approach is based on a constructivist educational paradigm, which is based on the view that learning is the activity of an individual, and one of the ways of achieving the research and creative approach in Serbian language grammar class. The study included 232 students of third and fourth grade. The results showed a positive effect of problem-oriented teaching on the quality of students’ knowledge of grammar. We found that the problem-based grammar teaching can be made more interesting for teachers and students in lower grades of elementary school. This research showed that problem-based teaching, as a modern educational system and didactic-methodical strategy, allows a new, creative way of access to grammar of Serbian language by putting students in a position of a subject which critically and creatively approaches the presented problems, developing their curiosity and ability to learn through the process.