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在教学分数乘法的简算之后,笔者批改学生作业时,发现有这样两道题目的出错率相当高:一是56×18+16×18,二是45×(1115-49)。学生的错误大多出在以下几点:1.56×18+16×18=(56+16)×(18+18).笔者考量分析后认为,这是对乘法分配律存在理解错误导致的,这个错误率占到了30%。2.56×18+16×18=56×(18×18).笔者认为,这是对乘法分配律与结合律混
After the simple calculation of the teaching score multiplication, when correcting the students’ assignments, I found that the error rate of such two topics is quite high: 56 × 18 + 16 × 18 and 45 × (1115-49). Most of the students’ mistakes lie in the following points: 1.56 × 18 + 16 × 18 = (56 + 16) × (18 + 18). After considering and analyzing, the author thinks that this is caused by misunderstanding of the law of multiplication assignment. Rate accounted for 30%. 2.56 × 18 +16 × 18 = 56 × (18 × 18) .In the author’s opinion, this is the law of assignment and combination of multiplication