在小学数学四则运算中,加法和乘法永远是可能进行的,就是说任何数都能相加或相乘。减法则不然,减法的条件很清楚,就是减数不能大于被减数。除法则又和减法有所不同,譬如能整除的除法有一定的条件限制,同时要想判断一个数能否被另一个数整除,是小学数学教学中比较困难的一个问题。下面就数的整除性和教学有关问题作些探讨。一、数的整除性为了进行整除性的判断,我们需要首先学习一下有关的定理。定 In elementary mathematics four operations, addition and multiplication are always possible, that is, any number can be added or multiplied. Subtraction is not the case, the conditions for subtraction is clear, that is, can not be less than the number of subtractions. The division rules are different from the subtraction. For example, divisions that can be divisible are subject to certain conditions. To determine whether a number can be divisible by another number is a difficult problem in elementary mathematics teaching. Following the number of divisibility and teaching-related issues for some discussion. First, the number of divisibility In order to make divisible judgments, we need to first learn about the theorem. set