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学生做完练习以后,教师要善于引导学生进行练后思考,探索数学规律,优化解题过程。从而培养学生的创造性思维。下面,试以五年制第十册(或六年制第十二册),小学数学课本中的三道习题为例,谈谈练后思考及其所得的数学规律。第一题(五年制第十册P.10的第9题):计算右图中阴影部分的面积。(单位:厘米)练习以后,先启发学生思考以下两个问题:在边长为6厘米的正方形里画一个最大的圆。(1)这个最大的圆的面积占正方形面积的百分之几?
After the students finish the exercises, teachers should be good at guiding students to practice thinking, exploring the laws of mathematics, optimizing the process of solving problems. Thus cultivating students' creative thinking. Next, we will take the three exercises in the tenth year of the five-year system (or the twelfth year in the six-year system) and the math textbooks for elementary schools as an example to discuss the mathematical rules of post-training thinking and its derivation. First Question (Question No. 9, P.10, fifth year) Calculate the area of the shaded area on the right. (Unit: cm) After practicing, first motivate students to think about the following two questions: Draw a largest circle in a square with a side length of 6 cm. (1) What is the largest area of a circle that is a few percent of the square area?