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小数点位置移动引起小数大小变化的规律中孕含着丰富的逻辑思维能力因素,主要是: 1.比较、分析的能力。这在规律的揭示过程中得到充分的体现。教学中教师可以设计这样一个板书: 首先引导学生从上往下观察,把①→②、①→③、①→④进行比较,得出它们分别扩大10倍、100倍、1000倍……再引导学生观察、分析比较,小数点的位置也向右移动了一位、两位、三位……从而把小数点位置移动和小数大小变化建立起联系,逐步板书出“向右移动”的规律性内容。同样,再引导学生从下往上观察、分析比较,④→③、④→②、④→①小
The law that the decimal place moves and causes the decimal size to change is pregnant with abundant logical thinking ability factor, mainly is: 1. Compare, analyze the ability. This is revealed in the process of law has been fully reflected. Teaching teachers can design such a blackboard: first guide students to observe from the top, the ① → ②, ① ③ ③, ① → ④ were compared to find that they were expanded 10 times, 100 times, 1000 times ... ... and then guide Student observation, analysis and comparison, the location of the decimal point also moved to the right one, two, three ... ... so that the decimal point position and decimal changes in the size of the establishment of contact, and gradually flat out a “move to the right,” the regular content. Similarly, then guide the students to observe from the bottom up, analysis and comparison, ④ → ③, ④ → ②, ④ → ① small