The need to transfer the mathematics learned at school to real-life and use mathematical knowledge in life has brought the expression of mathematical literacy to the fore. Meeting this need is possible by raising mathematically literate students in schools and planning education to achieve this. From this starting point, this study aims to introduce a teaching model called Dual-Focused Teaching, which is designed to develop mathematical literacy during mathematics instruction. Constructed based on data from a design-based research project, this model focuses on reaching, deepening, and reinforcing mathematical concepts and generalizations. The model's content includes learning theories on which it is based, its application in the lesson, and its reflection on the lesson on a sample lesson plan are explained in all aspects of this study. The need for this model, its applicability, and potential are discussed in light of the literature.