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参加一项研究课比赛活动,三位教师同课异构,教学内容是人教版五年级上册“组合图形的面积”。教材中的例题如下:讲课老师无一例外的让学生分小组讨论,可以有哪些方法求出图形的面积。学生们思维火花四溅,想出了种种方法。如分割法,把图形分割成一个三角形和一个正方形5×5+5×2÷2,或者分割成两个相等的梯形(2+5+5)×5÷2。如添补法,把三角形上面添补,变成一个长方形,
Participate in a research class competition activities, the three teachers heterogeneous, teaching content is PEP fifth grade volumes “area of the combined graphics ”. Examples of teaching materials are as follows: Lecture teachers, without exception, allow students to group discussions, which methods can be used to figure out the area of ?? graphics. Students think sparks, came up with a variety of ways. Such as segmentation, the graphics into a triangle and a square 5 × 5 +5 × 2 ÷ 2, or divided into two equal trapezoidal (2 +5 +5) × 5 ÷ 2. Such as Tim method, add the triangle above, into a rectangle,