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【案例】苏教版课程标准实验教科书小学数学四年级(下册)“倍数和因数”这一单元中,第一课时是数学倍数和因数的认识,学习找一个自然数的倍数和因数。认识倍数和因数不再像过去那样从整除概念入手,利用整除认识倍数和因数,而是通过学生的操作,利用整数乘法认识倍数和因数。在寻找一个数的倍数或因数时,也是引导学生依据倍数和因数的含义,运用已有的乘除法知识,自主探索找一个数的倍数或因数的方法。其中,教学找一个数的因数是这节课的教学难点。
【Case】 Sujiao version of the curriculum standard experimental textbook The fourth grade of primary school mathematics (the second volume) “multiples and factors” This unit, the first class is the mathematical multiples and the factor of understanding, learning to find a natural number multiples and factors. Recognition multiple and factor no longer start with the concept of divisibility as in the past, the use of divisibility recognition multiples and divisors, but through the operation of students, multiples of multiples known by multiples and divisors. When looking for a multiple or a factor of a number, it is also to guide students to explore the method of finding a multiple or a factor of numbers by using the existing knowledge of multiplication and division based on the meaning of multiples and factors. Among them, teaching to find a number of factors is difficult to teach this lesson.