MIT's 18.100B Real Analysis, taught by Tobias Holck Colding, devotes this session to a midterm review covering the material taught to date. Running 76 minutes, the lecture walks back through the course's foundational real analysis topics, working through problems and arguments of the kind students will face on the exam. It is a consolidation session rather than new material, aimed at reinforcing definitions, theorems, and proof techniques already introduced in earlier lectures on sequences, limits, continuity, and related topics in rigorous analysis. The format is standard MIT OpenCourseWare: a single instructor at the board working through problems and explanations for a student audience. Useful as a study aid for anyone following the full course, or as a compact survey of core real analysis techniques for someone refreshing their grasp of the subject before tackling more advanced material.