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教师应该以学生的认知发展水平和已有的经验为基础,面向全体学生,注重因材施教。在以往教学中,要判断某一年是不是闰年,就是用4或400除这一年的年份数。三年级学生只学习除数是一位数,被除数最大是三位数的除法,一位数除四位数这类题目,对学生来说,难度大,计算速度非常慢。作者结合多年数学学习经验,总结了一种特别简便的方法判断闰年,并用数学语言加以证明。
Teachers should be based on the level of cognitive development of students and existing experience as a foundation for all students, focusing on teaching students according to their aptitude. In previous teaching, to determine whether a year is a leap year, is to use 4 or 400 in addition to the number of years of the year. Third grade students only study the divisor is a single digit, the dividend is the largest three-digit division, one-digit addition to four-digit such topics, for students, the difficulty of computing speed is very slow. Based on years of experience in mathematics learning, the author summarizes a particularly simple and convenient way to judge leap years and prove it in mathematical language.