论文部分内容阅读
乘除法的定位是珠算教学中的一个难点。学生往往会把乘积68,500,错为6,850,或者是685,000;在除法中,4,852÷3=1,617……1,也极易答错为16,171。这一个难点,假使不能够想办法突破,就会使珠算的乘除法,计算得不准确。小学珠算教学大纲(草案)的说明中,也提到了这点,“珠算的定位很重要”。“特别在乘除法的计算中,更要求儿童能根据乘数、除数的位数多少来确定积数和商数的位置。此外,在学习除法时,还应使儿重在每一步演算後都能分清哪些数是商数,哪些数是馀数。”
The position of multiplication and division is a difficult point in abacus teaching. Students tend to multiply the product 68,500 by 6,850, or 685,000; in the division, 4,852 ÷ 3 = 1,617 ... 1, it is also easy to misread 16,171. This one difficulty, if you can not find a way to break through, it will make abacus multiplication and division, calculated inaccurately. This is also mentioned in the description of the Draft Abacus for Primary Abacus (Draft), “The Location of Abacus Is Important.” "In particular, in the calculation of multiplication and division, children are required to determine the position of the product of multiplication and division based on the multiplier and the number of digits of the divisor. In addition, when studying division, Can distinguish between the number of quotient and what is the remainder.