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一、案例前不久,我校一位年轻教师在教学人教版教材二年级下册“表内除法”时,遇到两道让她万分“纠结”的问题:问题一:请用画图表示12÷3。以下是学生比较典型的几种画法:如画法1和2:单看这两幅图,更合适的应该用乘法计算,而且不能完全反映出除法计算的过程。可如若判作错误,在教材中有些图就是要求学生列出乘法和除法算式,如教材第21页的这一题(如下图)。类似于这样的问题在教材中还比比皆是,强调的是乘除法之间的关系,那么学生这样画也有一定的道理。
First, the case Not long ago, a young teacher in our school encountered two problems that made her extremely “tangled” during the teaching of the second grade of the PEP teaching material “Dividing the Table”: Question 1: Please Draw 12 ÷ 3. The following is a typical picture of the students: Picture 1 and 2: Just look at these two pictures, more appropriate should be calculated by multiplication, and can not fully reflect the division process. However, if mistakes are made, some of the drawings in the textbook require students to list the multiplicative and division formulas, as shown in the text on page 21 (below). Similar to such problems in the teaching materials abound, emphasizing the relationship between multiplication and division, then students have such a reason to paint.