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这一天我讲的是乘法分配律,当讲完例题时,要求学生用学过的知识做书中的简便运算题。其中有这样一道题:25×12=?学生埋头练习,我巡视大部分学生的练习情况,完成后我拿其中两位同学做的给大家看。25×12 25×12=25×(10+2)=25×(4+8)=25×10+25×2=25×4+25×8=250+50=100+200=300=300我说:这两位同学算对了,两种算法都可以,你们是这样算的吗?是的请举手。学生们说:是!(学生纷纷举手自
On this day I am talking about the law of multiplication distribution. When I finish the example, I ask the students to use the learned knowledge to do the simple calculation in the book. There is such a question: 25 × 12 =? Students immersed in practice, I patrol the practice of most students, I completed two of my classmates for everyone to see. 25 × 12 25 × 12 = 25 × 10 + 2 = 25 × 4 + 8 = 25 × 10 + 25 × 2 = 25 × 4 + 25 × 8 = 250 + 50 = 100 + 200 = 300 = 300 I said: The two students are right, both algorithms can be, are you doing? Yes, please raise your hand. The students said: Yes! (Students have raised their hands