计算训练应有明确的目的,不能为练习而练习。精心设计的计算训练是锻炼学生思维的灵活性和敏捷性的有效手段。在运用运算定律和性质进行简便计算时,要求学生能根据数据的表面特征进行深入思考整个算式中各数的联系,需要学生有敏捷的思维。 Computational training should have a clear purpose and should not be practiced. Well-designed computational training is an effective way of exercising the flexibility and agility of student thinking. In the simple calculation of the laws and properties of the operation, students are required to think deeply about the relationship between the numbers in the whole calculation according to the surface features of the data, which requires students to have quick thinking.