【问题】目前的简算教学考查呈现出重计算轻应用的倾向,即考查形式主要甚至完全是纯粹的计算。有人指出,应该在应用情境中考查学生的简算掌握情况。但是,在具体的考查过程中,我们发现,有些简算方法在具体的情境中是“解释”不通的。这里的“解释不通”即指没有具体的数量关系作为支撑,为简便而简便的行为。是否有必要结合应用情境考查简算?碰到“解释不通”的情况该如何处理? [Question] The present teaching of simple calculation shows a tendency of recalculating light applications. That is, the test form is mainly or even entirely purely computational. It was pointed out that students should be examined briefly in the context of their application. However, during the specific examination, we found that some of the simplest methods in a concrete situation are “explain ” barrier. Here “does not explain ” means that there is no specific quantitative relationship as a support, for the simple and easy behavior. Is it necessary to examine the application of the situation in mind? Encounter “No explanation ” how to deal with?