我们在计算正整数乘以正整数,尤其是多位数乘以多位数(如321×123)的时候,通常采用列竖式的方法,如右式。不少学生似乎对列竖式计算这种严整规范的形式以及通过背诵乘法口诀结合列竖式来计算所带来的快捷方便早已司空见惯了,而对于为什么可以这样列竖式以及有没有别的替代方式,并没 We calculate the positive integer multiplied by a positive integer, especially the multi-digit multiplied by multiple digits (such as 321 × 123), the vertical column method is usually used, as the right. Many students seem to have become accustomed to the straightforward form of columnar computing and to the quickness and convenience of memorizing by memorizing multiplication formulas combined with columnar verticals, and why it is possible to justify such verticals and any other alternatives Way, not yet