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在传统的练习中,我们发现对类似于看图写乘法算式和用口诀来计算的问题,学生是非常熟练的。但是到解决问题时,特别是乘法和加法的对比练习中,许多学生又会模糊不清了。那么怎样的练习能帮助老师正确判断学生的掌握情况,而不是出现大问题之后,再“亡羊补牢”呢?一变式练习,丰富乘法意义的内涵知识的形成有一个“立”的过程,在经历多个加数相同的加法算式可以改写成乘法算式之后,我们还需要“破”的过程,即打破学生的思维定式。如乘法意义建
In the traditional exercises, we found that students were very skilled at the problems that were analogous to the plotting of multiplication formulas and formulas. But when it comes to solving problems, especially in the comparative exercises of multiplication and addition, many students are obscured. So what kind of exercises can help teachers to correctly judge the students grasp the situation, rather than a big problem, and then “change”, a variety of exercises, enriching the meaning of the meaning of multiplication, the formation of knowledge has a Process, after experiencing the same addition of more than one adder can be rewritten into a multiplicative formula, we also need “broken ” process, that is, to break the student’s mindset. Such as multiplication meaning built