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教师A在教学“长方体和正方体的认识”探究长方体的特征时,设计了这样的教学环节:学生以四人小组为单位,利用教师课前准备好的学具(小棒、一些橡皮泥和一些长方体纸片)制作一个长方体模型。听清要求后学生就纷纷动手操作起来。学生操作二十几分钟后有些小组做出了较标准的长方体模型,可是有的小组做出的长方体就是不像样,大部分小组连一个完整的长方体也完成不了。
Teacher A designed this teaching aspect when he came to explore the characteristics of a cuboid in the teaching “Knowledge of Cuboids and Cubes.” Using a four-member team as a unit, the teacher availed himself of a set of schoolware (small sticks, some plasticine And some rectangular paper) to make a cuboid model. After listening to the requirements of students have hands-on operation. After a few minutes of operation, some groups made more standard cuboid models. However, some of the cuboids made by the group were not the same. Most of the groups could not even complete a complete cuboid.