“简便计算”的本意应该是通过灵活、正确、合理地运用各种性质、定律,让复杂的计算变简单,从而大幅度地提高计算速度及正确率。但随着简算的类型不断增加,简算方法多样化之后,学生的错误就各种各样,层出不穷。剖析错误原因,寻找解决策略,让简算真正简便。 The simple meaning of “simple calculation” should be to make the complicated calculation more simple by using various nature and law flexibly, correctly and reasonably, so as to greatly improve the calculation speed and accuracy. However, with the increasing types of simplest calculations, students’ mistakes are manifold and emergent after the simple method of diversification. Analysis of the reasons for the error, looking for solutions to make simple calculations really simple.