Specific reference. 1. Correspondence thinking method Correspondence is a way of thinking about the relationship between two setting factors. Mathematics in primary schools is generally a one-to-one intuitive chart, which breeds the idea of function. For example, there is a one-to-one correspondence between points (number axes) on a straight line and specific numbers. 2. Hypothesis thinking method Hypothesis is a thinking method that first makes some assumptions about the known conditions or problems in the topic, then calculates according to the known conditions in the topic, makes appropriate adjustments according to the contradiction in quantity, and finally finds the correct answer. Hypothetical thinking is a meaningful imaginative thinking, which can make the problem to be solved more vivid and concrete after mastering it, thus enriching the thinking of solving problems. 3. Comparative thinking method Comparative thinking is one of the commonly used thinking methods in mathematics and a means to promote the development of students' thinking. In the application of teaching scores, teachers are good at guiding students to compare the situation before and after the change of known quantity and unknown quantity, which can help students find solutions quickly.