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学好除数是两三位数除法的关键,是熟练地掌握试商方法。这一点,每位数学教师都十分清楚。但如何使学生能熟练地掌握试商方法,提高一次试商的成功率,笔者的管见如下: 一、加强口算训练。 口算是试商的基础之一,学生口算的熟练程度直接影响试商的效果。因为任何一种试商方法,都要用到口算。所以,在教学试商方法之前,就要对学生进行两位数乘以一位数的口算训练,特别是整十数乘以一位数以及个位数是5的两位数,如15、25、35……95乘以一位数的口算,要使学生达到熟练地能脱口而出的程度。这样有利于提高学生的试商速度。
Learning good divisor is the key to the division of two or three digits, is to master the trial method. This point, every math teacher is very clear. But how to enable students to master the trial method, improve the success rate of a trial, the author of the tube as follows: First, to strengthen the mouth training. Mouth count is one of the basis of trial business, the degree of proficiency of students directly affect the trial results. Because of any kind of trial method, we must use the mouth count. Therefore, prior to teaching a test method, students should be trained on double-digit multiplication by one figure, especially the whole number multiplied by one digit and the double digit with a unit digit of 5, such as 15, 25, 35 ... 95 multiplied by one-digit arithmetic, to enable students to be proficient enough to blurt out. This is conducive to improving the speed of the students trial.