苏教版三年级(下册)第33页例题(图1)。图中小萝卜、小辣椒、小草莓说的话都是预设的学生的话,在实际教学中,小萝卜说的话“估计得数比800多”(以下简称方法一),小辣椒说的话“估计得数比1500少”(以下简称方法二),学生没有想到上述估算方法,直接想到把两个乘数看成与它接近的整十数,接着估算出得数大约是多少,即小草莓说的话“估 Su Jianban third grade (second volume) page 33 example (Figure 1). Small radish, peppers, small strawberries say words are the default students, in actual teaching, the radish said ”estimated more than 800 “ (hereinafter referred to as method one), the little pepper said ”Estimate less than 1500“ (hereinafter referred to as method 2), students did not think of the above estimation method, directly think of the two multipliers as an integral number close to it, and then estimate the approximate number of how, namely Strawberry said ”Estimated