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我在教“小数点的位置移动引起了小数大小的变化”一节时,发现有些学生总是搞不清小数点位置与小数大小的关系,如老师要求把0.5扩大100倍,他们就写成0.50;要求缩小10倍,他们就写成00.5。为了突破这个难关,我采取了以下的直观教学方法。 准备一条大约一尺长的透明胶片,在上面画一个红圆点;再准备两条细长的透明胶布。上课时,先在黑板上写上某一个多位数,然后用两条透明胶布将胶片固定在这个数中间,使这个多位数成为一个小数。固定时,要注意使胶片能左右自由移动
When I was telling “the change of the decimal point caused by the movement of the decimal point”, I found that some students always found out the relationship between the decimal point position and the decimal size. If the teacher asked to expand 0.5 by 100 times, they would write 0.50; Shrink 10 times, they write 00.5. In order to break through this difficulty, I have adopted the following intuitive teaching methods. Prepare a piece of transparencies about one foot long and draw a red dot on top; then prepare two slender, transparent tapes. In class, first write a multi-digit number on the blackboard, then use two pieces of clear tape to hold the film in the middle of the number, making the multi-digit a decimal. Fixed, we must pay attention so that the film can freely move around