【教学内容】北师大版教材三年级上册“搭配中的学问”。【设计背景】本节课学习的内容是排列组合问题,但不是学习排列组合的知识。因此,不能过于重视最终结果和强调通过计算得出结论,而要充分利用教材提供的素材,引导学生观察、操作,逐步培养学生有顺序地、全面地思考问题的意识。在活动中,不要急于规定用统一的符号表示搭配的 【Teaching content】 Beijing Normal University version of the third grade textbook “with learning”. 【Design Background】 The content of this lesson is to arrange the combination of problems, but not to learn to arrange the combination of knowledge. Therefore, we should not pay too much attention to the final result and emphasize the calculation to draw conclusions. Instead, we should make full use of the materials provided by the textbooks to guide the students in their observation and operation and gradually develop students’ awareness of thinking in an orderly and comprehensive manner. In the event, do not rush to provide a unified symbol that with