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1.定商,就是确定商的位置,是试商的前提和基础。在两三位数除多位数的教学中,定商的一个作用是使学生懂得不管除数是几位数,都要从被除数的商位除起,除数是几位数,相应地看被除数高位上的几位数,这几位不够除时,再看下一位,(如用两位数除,被除数最高两位不够除时则看三位)。每次除到被除数哪一位,商就写在这一位上。定商的另一个作用是:定了商就知道了这个商是几位数,可以帮助检验商是否正确,特别是对于商中间和商末尾有0的除法题,便于检验商中有没有丢掉0。
1. Ding business, is to determine the location of business is the premise and foundation of the trial. In the two or three digits in addition to multi-digit teaching, one of the roles of the quotient is to enable students to know regardless of whether the divisor is a few digits, divided by the quotient of the divisor, the divisor is a few digits, and accordingly the highs of the divisor On the number of several, these few are not enough time, look at the next one, (such as the use of two-digit addition, divide the highest two are not enough, then look at three). Every time in addition to the dividend which one, the business is written in this one. Another role of the fixed quotient is: a firm knows how many quotient this firm can help to verify the correctness of the quotient, especially for the division between the middle of the quotient and the quotient of 0, so as to make it possible for the verifier to lose 0 .