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从事小学数学教学30年了,我都有一个习惯,学生要做的题,我都要先做一遍。一是我要看看这些题的难易程度,确定哪些题需要指导和评讲:二是有些数学题的解题方法很重技巧,选择哪种方法、怎么评讲才能深入浅出,才让学生都懂,并体会到“数学不难”。上次期末复习卷中有这样一道题:甲乙两人分别从A、B两地相向而行,8分钟可以相遇。如果甲每分钟少走10米,乙每分钟多走30米,则7分钟可以相遇。A、B两地相距多少米?初看这道题,就引起了我的重视,数量关系不明显,甚至有无从着手之感。于是我画出如下线段图:
Engaged in primary school mathematics teaching for 30 years, I have a habit, students have to do the title, I have to do it again. First, I have to look at the difficulty of these questions to determine which questions need guidance and commentary: Second, some mathematical problems are very tricky to solve the problem, choose which method, how to comment can explain profound theories in simple language to let students Understand, and experience “Mathematics is not difficult ”. Review the volume at the end of the last month there is such a problem: A and B from the two A, B, respectively, two lines, 8 minutes to meet. If A per minute take 10 meters less, B more than 30 meters per minute, then 7 minutes to meet. A, B, how many meters apart? The first look at this question, it attracted my attention, the number of relations is not obvious, or even start with no sense. So I draw the following line segment: