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案例一:《长方形面积计算》教学片断上课一开始,教师在复习了面积含义和面积单位后,用两个3×5和2×7(厘米)的长方形引出学习面积计算的必要性后,引导学生探究长方形面积与长和宽的关系。过程如下:师:猜一猜长方形的面积与什么有关?生:(很自信)长方形的面积与它的长和宽有关。
Case 1: The Teaching of “Area Calculation of Rectangle” At the beginning of the class, after reviewing the meaning of area and the unit of area, the teacher guided the necessity of calculating the learning area with two rectangles of 3 × 5 and 2 × 7 (centimeters) Students explore the relationship between rectangular area and length and width. The process is as follows: Teacher: Guess what the area of the rectangle is related to? Student: (Confident) The area of the rectangle is related to its length and width.