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教学片断一:师(出示图1):请用不同的方法,求出图中各个图形的周长。师:图中正方形的周长是多少呢?生1:周长是16cm。师:图中长方形的周长是多少呢?生2:周长是14cm。师:再看这个组合图形(电脑动态显示将长方形和正方形复制后粘贴在一起,即长方形粘贴在正方形的右侧),你能算出这个图形的周长是多少吗?生3:30cm。生4:26厘米。生5:28厘米。……师:同学们,一个方格是1厘米,我们一起数数吧,看看
Teaching a fragment: division (shown in Figure 1): Please use different methods, figure out the figure of the perimeter. Teacher: What is the circumference of the square in the picture? Health 1: The circumference is 16cm. Teacher: What is the circumference of the rectangle in the picture? Student 2: The circumference is 14cm. Teacher: Look at this combination of graphics (computer dynamic display of rectangular and square copy and paste together, that is, the rectangle pasted on the right side of the square), you can figure out the number of perimeter of this figure? Students 4:26 centimeters. Students 5:28 cm. ... ... Division: Students, a box is 1 cm, we count it together, take a look