义务教育小学数学教学大纲指出，小学数学教学要使学生既长知识又长智慧。在加强基础知识的同时，要启发学生动脑筋想问题，要鼓励学生质疑问难，提出自己的独立见解，逐步培养学生有条理、有根据地进行思考。学生思维能力的培养和发展，需要一个长期的训练过程。所以，在教学 Compulsory primary school mathematics syllabus pointed out that primary school mathematics teaching to enable students to have long knowledge and long wisdom. While strengthening basic knowledge, we should inspire students to think hard about their problems, encourage students to ask questions and put forward their own independent opinions, and gradually develop students' methodical and base-based thinking. The cultivation and development of students' thinking ability requires a long-term training process. So, teaching