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我在教学“质数和合数”时,注意让学生动手动脑,充分发挥他们在课堂上的主观能动作用,收到了比较好的效果。在课前,师生共同制作具有红、黄、蓝、绿四色的三角形、圆形和正方形的若干硬纸模型。课上让学生把这些教具进行分类。有的同学按形状分三类,有的学生按颜色分四类。通过自己动手分类,使学生初步懂得:分类要有一个标准,标准不同,分类的结果也不同。
When I was teaching “prime numbers and amalgam”, I paid attention to letting students use their heads and give full play to their subjective initiative in the classroom and received good results. Before class, teachers and students together produce a number of cardboard models with triangles, circles and squares of red, yellow, blue and green colors. Class for students to classify these aids. Some students divided into three categories by shape, and some students by color divided into four categories. Classify by yourself, so that students initially understand: classification should have a standard, different standards, the classification results are also different.