怎样灵活求商

• 作 者: 周平健 毛鹤余
• 机 构: 江苏,江苏,江苏
• 出 处: 良师
• 发表日期: 2004年期
• 关键词: 试商 四舍五入法 折中法 够除 平健 调商 个位数 最高位 时可 数法

在做除数是两、三位数的除法时,同学们一般采用“四舍五入法”试商。这种方法往往不能一次试商,需要调商。为了使你的计算又对又快,下面介绍几种试商方法,供同学们参考。一、去尾法运用“四舍五入法”试商,是去掉除数和被除数的尾数后试商。例如324÷42,试商时可以看作300÷40;

In doing divisor is two, three-digit division, students generally use the “rounding method” to try. This method often can not be a trial, need to reconcile. In order to make your calculations again and again, the following describes several test methods for students to reference. First, to the tail method Use “rounding method” to try, is to remove the division and dividend mantissa after the trial. For example, 324 ÷ 42, trial can be regarded as 300 ÷ 40;