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对于小学生来说,《用字母表示数》一课从算式中具体的、确定的数和式子,到用字母和含有字母的式子表示某一范围的、可变的数和式子、数量之间的关系,这是认识上的一次重大转折。在教学设计与课堂实践时,我不断地思索并改进例题的教学。一、初次试教,为“本”为本初次试教直接采用了苏教版教材中的例题。教师引导:摆一个三角形需要的小棒根数是——3。摆二个三角形需要的小棒根数是——2×3。摆三个三角形需要的小棒根数是——3×3。师:你能接着说下去吗?
For elementary school students, “alphanumeric” a lesson from the calculation of specific, the number and formula to determine the use of letters and letters containing the formula that a range of variable numbers and the number of This is a major turning point in our understanding. In teaching design and classroom practice, I constantly think and improve the teaching of examples. First, the first trial, for the “Ben ” based on the first trial teaching direct use of the Sujiao version of teaching materials in the sample. Teacher Guidance: The number of sticks needed to make a triangle is - 3. The number of sticks needed to set two triangles is - 2x3. The number of sticks needed to set the three triangles is - 3 × 3. Teacher: Can you go on?