在学生作业中经常会见到:“一张床的长度是2厘米”、“一个鸡蛋的重量是6吨”“教师的身高是175米”“王明每分钟走1米”这类错误。我们往往感到又气又好笑,常常感叹怎么就不联系实际想一想,怎么心中这点“数”也没有!对于这些错误,我们一般会认为学生的解题方法没有掌握,并且以此入手去解决问题,而很少去研究其形成的深层原因,其实这是学生没有良好的数感造成的。那么,如何培养学生 Often in student work will see: “a bed length is 2 cm ”, “an egg weight is 6 tons ” “the teacher’s height is 175 meters ” “Wang Ming walk every minute M ”such mistakes. We often feel angry and funny, often lamented how not to think about the actual situation, how the heart of this “number” is not! For these errors, we generally think that students have no way to solve the problem, and as such Start to solve the problem, and rarely to study the underlying causes of its formation, in fact, this is the result of a student does not have a good sense of the number. So, how to train students