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在解决实际问题过程中,个体对估算能力的实用更为频繁,因此对于估算能力的培养越来越受重视。在小学第一阶段百以内、千以内、万以内数的认识后都有安排用估算解决问题的例题。但是在教学估算时,往往难以达到教与学的协调,表达与想法的协调,学与用的协调。就像在驾驭马车时,车夫的想法和马儿的想法难以协调统一,车夫无法朝着正确的方向前进,马儿也无法发挥出自己的水平。情境呈现:例题:巨幕影院有441个座位,一到三年级来了
In the process of solving practical problems, individuals are more and more practical about the ability to estimate, and therefore, more and more attention is paid to the cultivation of the ability to estimate. In the first phase of primary schooling, there are examples of arranging estimates to solve problems after being acquainted with each other within a hundred or less, within a thousand or less. However, in teaching estimation, it is often difficult to achieve the coordination of teaching and learning, the coordination of expression and thought, the coordination of learning and use. Just as the driver’s idea and the horse’s idea are hard to reconcile, the coachman can not move in the right direction and the horse can not perform at his own level. Situation: Example: The giant screen theater has 441 seats, the first three grades came