Pay full attention to the training of children's thinking. Mathematics is a logic subject, which is abstract, accurate and widely applied. Mathematics teaching is the teaching of mathematical thinking activities. Based on the understanding of these two characteristics, I think the core of mathematics classroom teaching is to cultivate students' thinking ability in any situation. Many experts also mentioned the evaluation criteria of a class in their lecture reports. Experts agree that the success of a class depends on whether classroom teaching effectively promotes the development of students and whether students have the participation of thinking essence.