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统编《数学》六册的长方形面积公式,一般采用数一数方格图,就推导出计算公式,再运用公式进行计算的教法。这样,学生虽能掌握公式,但他们在头脑中很难保持方格图形的表象,致使今后一个较长时间内,只知道按公式列算式,不理解已知条件是长度单位,而计算结果却是面积单位的道理。为克服这一弊端,我们将原教法改成连续观察不同的图形,使方格图有一个从有到无的变化过程,学生对长度单位转化为面积单位也有个思考过程,教学效果较好。简要
The compilation of “rectangular” area formula of “mathematics” six volumes, generally using the number one grid chart, to derive the formula, and then use the formula to calculate the teaching method. In this way, although students can grasp the formula, it is difficult for them to maintain the appearance of a checkered pattern in their heads. As a result, for a long time to come, they will only know how to formulate the formula according to the formula and do not understand that the known condition is a unit of length. It is the unit of area. In order to overcome this shortcoming, we changed the original teaching method to continuous observation of different figures, so that there is a process of change from chengdu to chengdu. The students also have a thinking process of converting the unit of length into units of area, and the teaching effect is better . brief