一、让学生感到“真像”在教学“小数点的位置移动引起小数大小的变化”一课时,遇到了这样一类题:把一个小数的小数点先向右移动若干位,再向左移动若干位(位数不同),结果跟原来的小数比怎样?数据小一点儿,学生还能在那里数数,数据一大,学生们便无所适从了。怎么让他们理解其中的关系呢?我灵机一动,便招呼同学们看着我,当全班同学的眼光齐刷刷地聚集在我身上时,我在地上画了几个格子。学生们 First, let the students feel “real like ” in teaching “a decimal point position changes caused by the decimal size ” class, encountered such a problem: the decimal point of a decimal number to the right to move a few first, Left shift a number of bits (different number of bits), the result with the original decimal than how? The data is smaller, the students can count in there, a big data, the students know what to do. How to make them understand the relationship? I am inspired, they greet the students looked at me, when the eyes of the classmates gathered together on me, I draw a few grid on the ground. students