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看了贵刊2006年第10期《神奇的“弃九法”》一文,为“弃九法”验算方法拍手叫好。作者全面列举分析了用“弃九法”验算加减乘除的一般情况和特殊情况。方法简单易学,学生易掌握,乐于接受,对提高学生计算准确性有一定帮助。但笔者认为有两种情况用“弃九法”验算需另作说明,现特提出与作者商榷。一是乘法计算中积末尾有0的乘
Read your magazine in 2006 No. 10 “magic” abandoned nine “,” for “abandoning nine” method of checking applause. The author gives a comprehensive enumeration and analyzes the general situation and special cases of adding, subtracting, multiplying and dividing with “discarding nine methods”. The method is simple and easy to learn, the students are easy to grasp and are willing to accept, which will help to improve the accuracy of students’ calculation. However, I think there are two cases with “Abandon nine ” verification requires additional explanation, are especially proposed to discuss with the author. First, multiply the end of the plot in the product by zero