论文部分内容阅读
二年级《认识厘米》的教学,通常先让学生认识直尺,找数字、字母“cm”及长短不一的竖线后,再教学认识1厘米。教学中,教师关注1厘米的表象建立,认识直尺的教学往往一带而过,不少学生对于直尺上的数为什么从“0”开始,常常疑惑不解。我在教学中做了这样的尝试:给每个学生准备了几根长度是1厘米的小棒。下面是这一课的教学片段。【片段1】小棒量长度,体会造尺需要(同桌合作,用摆小棒的方法量一量纸条长几厘米,如图1。)
Second grade “centimeter” teaching, usually first let students know ruler, find numbers, letters “cm ” and the different length of the vertical line, then teaching 1 cm. Teaching, the teacher concerned about the appearance of a centimeter, ruler recognition of teaching often over, many students on the ruler on the number of why from the “0 ”, often puzzled. I did such an experiment in teaching: for each student to prepare a few length is 1 cm small stick. The following is a lesson in this lesson. [Fragment 1] a small amount of bar length, need to understand the need to make (with the same table, a small amount of stick with a few centimeters long, as shown in Figure 1.)