Significance of bar graph: A bar graph represents a certain amount with unit length, draws straight lines with different lengths according to the amount, and then arranges these straight lines in a certain order. The advantage of a bar chart is that it is easy to see the quantity.

The characteristics of bar charts can make people see the size of each data at a glance. It is easy to compare the differences between the data. The statistics we have studied are horizontal bar statistics, vertical bar statistics, simple statistics and retest statistics.

Methods of learning primary school mathematics well

Pay attention to the content of the textbook. Book knowledge is the most basic part for primary school students to learn mathematics. Primary school students must pay attention to the knowledge points in books, whether it is the concepts, formulas or exercises in books, they must master them skillfully. If primary school students want to master the knowledge points of books more skillfully, they can read every chapter of math textbooks carefully from beginning to end.

Through comparative analysis, many species and other related knowledge come from the same basic concepts and methods, or seemingly the same but essentially different knowledge. The main way to learn this kind of knowledge is to find the connection and grasp the comparison and analysis. Such as straight lines, rays and line segments, which are both related and different.

Do more exercise. If you want to learn junior high school mathematics well, you must do more exercises. Doing more exercises does not mean engaging in sea tactics. Just doing without thinking can't consolidate the concept. The role of broadening the mind is to ask everyone to think more after making a novel topic: what knowledge it uses, whether it can be explained more, whether its conclusion can be strengthened and popularized, and so on.