This research aims to analyze the students' mathematical mindsets theoretically and empirically in context. The research analyzes the students' answer on mathematical problem solving. Forty-seven 8th grade students of a junior high school participated in this research. The researchers collected data in mixed methods research design with explanatory sequential design. The result shows that the essential cores of mathematical mindsets model are: abstraction, conceptual and procedural knowledge, that operate simultaneously in constructing the mathematical mindsets.