The role of "drawing" in primary school mathematics teaching can not be ignored. Mathematics is the gymnastics of thinking, and the draft is the training ground of thinking. The effective use of draft is an important carrier to improve students' thinking ability and change their learning style, and it is also an important helper to improve students' problem-solving ability.

Drawing can ensure the correctness of the calculation process and results as much as possible. Especially for problems involving a lot of calculations, it is particularly important to draft.