No. Because the teacher first of all, she is an ordinary person in life, and she also needs to live, and if she uses mathematical thinking to buy things, the fun of shopping will not be enjoyed. Therefore, the teacher is also a man of temperament, usually shopping, will not use mathematical thinking to calculate whether a thing is economical or not.

Some people may misunderstand mathematical thinking, and other mathematical thinking is used in teaching. For example, when the second-grade teacher is teaching the picture question "How many small trees are there". After reading the picture, the teacher asked, "What else do you see?" A student raised his hand and replied, "I also see that Xiaoming and Xiaohua want to plant trees." Because "I want to plant trees" is a subjective idea, not a mathematical problem. Then the teacher's guidance only stays on the mathematical materials, without guiding students to form mathematical thinking from the mathematical materials. That is the lack of the concept of "number sense", that is, mathematical operation thinking. If you ask the question in turn, "Can you ask a mathematical operation question according to these conditions?" Then this direction is right, and the effect of students' answers is very different.