"Learning by doing" and "Life is education" put forward by Mr. Tao Xingzhi, a famous educational practitioner, have certain enlightenment significance to teaching practice. Therefore, in our primary school mathematics classroom teaching, we should put the cultivation of students' practical ability in an important position and make it an important way for students to learn mathematics. One; Cultivating students' practical ability in developing students' thinking is to create an environment for students to explore, guess and discover, so that every student can participate in the activities of exploring new knowledge, develop their own ability in practice and finally succeed. In the teaching of "angle measurement", students have mastered the method of measuring angles with protractor, and can draw a fixed angle (such as 120 angle) with protractor. After the exercise, the teacher gave the students a chance to do it: "Students, we all draw an angle of 120 with a protractor. If you don't use a protractor, students will start to operate and report after the questions are raised. Most of the students in the class draw with the angles on a triangle. (1) The angle of 90 is combined with the angle of 30. (2) A 60-degree angle is combined with a 60-degree angle. (3) Innovative thinking: Draw a right angle first, and then remove a 60 angle ... Then the teacher continued to ask: "Can you draw an angle of 15 with the above method? "Students have experience in solving the above problems, and it is not difficult to operate again. The teaching effect can be imagined. Second; It is the best teacher to cultivate students' practical ability by stimulating their interest in learning, so how to cultivate students' practical ability in mathematics classroom teaching? When teaching Statistics and Probability, students are given an assignment in advance: after returning home, sum up the expenses of water, electricity, gas and telephone in the last month and the total income and expenditure of the family in the last month. The data needed are real materials in real life, so students are full of interest, and they actively participate in the investigation and practical activities. In class, the teacher asked them to make statistical charts according to the survey data, and then compared and analyzed the data according to the produced statistical tables, and put forward their own rationalization opinions and suggestions. The children were particularly interested and the teaching effect was quite good. In the process of investigation, drawing and data analysis, students fully realized that the essence of mathematics comes from life and is applied to life, and further realized that "mathematics is useful", so they liked mathematics learning. Judging from the teaching of this class, the content goes beyond the textbook itself, but focuses on students' sense of participation.