商不变性质,课本上是利用一个除法算式6÷3=2依次分别将被除数和除数扩大10倍而得到的一组算式:60÷30=2,600÷300=2,6000÷3000=2来说明的。例子具体明显,学生极易接受。又通过例9、例10的练习,学生很快掌握了多位数除法中被除数、除数末尾有零的简便算法。例11是通过一道应用题的算式8500÷200=42……100来说由于余数“1”是在原来被除数的百位上,应该是1个“百”,而不是“1”。根 Quot; is the invariant property, the textbook is to use a division formula 6 ÷ 3 = 2 followed by the dividend and the divisor were expanded by 10 times a set of equations: 60 ÷ 30 = 2,600 ÷ 300 = 2,6000 ÷ 3000 = 2 to illustrate of. Examples are obvious, students are very easy to accept. Again, through the exercises of Example 9 and Example 10, the student quickly mastered the simple algorithm of dividing a number in a multi-digit division by zero at the end of the division. Example 11 is a question of “100” instead of “1” since the remainder “1” is a hundredths of the original dividend by the formula 8500 ÷ 200 = 42 ... 100 of an application question. root