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案例背景:苏教版小学数学五年级上册第二单元是学习多边形的面积,其中第2课时安排了三角形面积的计算,这部分内容是在学生初步掌握了平行四边形、三角形的特征、认识了长方形、正方形及平行四边形的面积的基础上开展的教学活动。通过这部分内容的学习,一方面能使学生掌握三角形面积计算的方法,能相对独立地探索并解决实际生活中与三角形面积相关的实际问题;另一方面,也为学生进一步探索并掌握其他平面图形的面积计算方法,进一步学习空间与图形领域的其他内容奠定基础。结合本班学生的实际情况和学生已有的知识水平,根据教材设计时,引导学生从猜想出发,通过实际动手画一画、折一折、拼一拼等操作,结合前一课时学习的平行四边形的面积计算推导验证到三角形面积的计算方法并归纳出三角形面积的计算公式。最后,让学生运用所学知识解决生活中的实际问题,
Case background: Sujiao version of elementary school mathematics fifth grade second unit is to learn the area of polygons, of which the second class arranged for the calculation of the area of the triangle, which is part of the students initially mastered the characteristics of parallelograms, triangles, met the rectangle , Square and parallelogram based on the area of teaching activities carried out. Through this part of the content of learning, on the one hand enable students to grasp the method of calculating the area of triangles, can be relatively independent to explore and solve practical problems with the actual area of the triangle area; on the other hand, but also for students to further explore and master the other plane The calculation of the area of graphics, and further study space and other aspects of the graphics form the foundation. Combined with the actual situation of students in this class and students have the knowledge level, according to the teaching materials designed to guide students starting from the guess, through practical hands-on painting, folding, folding and other operations, combined with the previous lesson when learning parallel Quadrilateral area calculation Derived to verify the calculation of the area of the triangle and summed up the formula of the area of the triangle. Finally, to enable students to use their knowledge to solve practical problems in life,