除数是两位数的除法的教学重点、难点是试商,学生能否熟练地掌握试商方法,直接关系到计算能力的高低。为此,在讲授教材中介绍的四舍五入试商法和口算试商法的基础上,教者还可以选编一些习题,教给学生多种试商方法,拓宽试商思路,灵活选用试商方法,以提高他们试商的技能,正确而迅速地进行计算。 Divisor is the teaching of double-digit division of teaching, the difficulty is trial business, students can master the trial method, is directly related to the level of computing power. To this end, based on the rounding trial method and the oral test method introduced in teaching materials, the teacher can also choose some exercises to teach students a variety of trial methods, broaden the trial business ideas, flexible selection of test methods to improve Their trial skills, correct and prompt calculation.