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【教学内容】人教版数学四年级下册第九单元数学广角鸡兔同笼,第103-107上的内容。【教学目标】1.能抓住鸡兔同笼问题的特征,会用假设法解决鸡兔同笼问题。2.引导学生用表格法与数轴法突破鸡兔同笼问题的解决难点,经历数学思考的过程,通透理解假设法的本质。3.渗透数形结合思想。培养学生学习数学的积极情感。【教学重点】假设法的建模【教学难点】由列表法向假设法的迁移【教学过程】
【Teaching content】 PEP fourth grade under the ninth unit mathematics wide-angle chicken with cage, the first 103-107 of the content. Teaching Objectives 1. Capturing the characteristics of a chicken cage with a cage problem will solve the problem of a chicken cage cage with a hypothetical approach. 2. To guide students to use the table method and the number of axis method to break the chicken cage with the same problem of solving the problem, through mathematical thinking process, transparent understanding of the nature of the hypothesis. 3. Penetration with the number of ideas. Develop students’ positive emotions in learning mathematics. Teaching focus modeling of hypothetical law teaching difficult by the transfer of the list of normal assumptions [teaching process]