The document discusses the evolution of math education approaches from empiricism to progressivism and constructivism. Empiricism focused on teacher-centered lecture and memorization, but this did not develop problem-solving skills. Pragmatism recognized the need for change to engage students. Progressivism made learning child-centered and interactive. Constructivism involves students through complex problems, reflection, and making their own conclusions. The author's experience transitioning from empiricism to embracing approaches like Complex Instruction that engage students in collaborative problem-solving.