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一、问题缘起前不久学生数学练习作业中出现了一次普遍的错误现象,引发了我的思考。有这样一道练习题:小军收集了一些画片,他拿出画片的一半还多1张送给小明,自己还剩25张。小军原来有多少张画片?对此,许多学生是这么解答的:(25-1)×2=48(张)。显而易见,这个答案是错误的。可当时这样解答的学生丝毫不认为自己的答案是错误的,也有部分人甚至对该题束手无策。这道题对于六年级的学生而言,思维难度并不大,本来不应该有那么多的人失误。我让学生自己分析错误的原因,原来是大家都有一个共同的不良解答习惯,题目一读完就赶着做,做完不作
First, the problem began shortly before the students practice math exercises appeared in a common error, triggered my thinking. There is such an exercise: Xiao Jun collected some pictures, he took out more than half of the picture one to Xiao Ming, 25 left. How many of the original small army pictures? To this, many students answer (25-1) × 2 = 48 (Zhang). Obviously, this answer is wrong. The students who did so at that time did not think their answer was wrong, and some of them even got in the way. This question for sixth-graders, thinking difficulty is not large, there should not have been so many mistakes. I let the students analyze the reasons for their own mistakes, the original is that we all have a common bad habits, finished the first rush to do the problem, done not