Fourth Grade Math Units 1-8 Thinking Maps Chapters are roughly:Unit 1 Thinking Maps Knowledge of Large Numbers (Knowledge of, reading, writing, and comparing sizes up to a hundred million;); Unit 2 Unit 3: Knowledge of angles (understanding line segments, straight lines and rays, understanding, measuring and classifying angles and drawing angles); Unit 4: Knowledge of multiplying three-digit numbers by two-digit numbers; Unit 5: Knowledge of parallelograms and trapezoids (also including drawing perpendicular lines, rectangles and distances from points to straight lines); Unit 6: Knowledge of dividing numbers into two-digit numbers; and Unit 7: Knowledge of dividing numbers into two-digit numbers. Division is two-digit division (the most content, focus on mastering); unit 7 knowledge of bar charts; unit 8 knowledge of mathematical wide-angle problem optimization (mainly to understand the tea problem, pancake problem and Tianjijie horse racing these three practical applications). These unit test points will be drawn into a series of mathematical mind map list of the content of the chapters, not much knowledge will be attached to some of the unit error analysis questions, so that students really go to the understanding of the links between the first four units of the test points, so that solid mathematical theoretical knowledge.