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【案例背景】《三角形面积》从内容所处教材位置来看,属于人教版五年级数学教材上学期内容;从内容衔接来看,是在学生熟悉长方形、正方形以及平行四边形面积之后;从前后导入来看,是需要在平行四边形面积推导的基础上开展;从新课标要求来分析,需要采取自主、合作、探究的方式进行,据此教师需要积极搭建平台,创造学生操作机会,启发引导学生进行猜想、动手操作以及最终验证来得到结论。在这过程中,还需要引导学生感知数学思维,学会
【Case Background】 The area of the triangle is the last term of the fifth grade of the PEP teaching material from the position of the teaching materials where the content is located. After the students are familiar with the area of the rectangle, square and parallelogram, In terms of introduction, it is necessary to derive from the area of the parallelogram. Based on the requirements of the new curriculum standard, we need to take an autonomous, cooperative and exploratory approach. Teachers should actively build a platform to create opportunities for students to operate and inspire and guide Students make conjectures, hands-on exercises, and final verifications to reach conclusions. In this process, we also need to guide students to perceive mathematical thinking and learn