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在小学数学中,往往被大家忽略的是计算题,认为计算题最容易。其实,计算四则混合运算式题和解答应用题一样,也要进行思考和选择计算方法。在辅导孩子做计算题时,一般要教给孩子按这样的顺序去想。即: 一、观察特点,考虑简算方法做计算题不能见题就算,应先细心观察算式中数字的特点,先要考虑运用运算定律或运算性质使计算如何简便(应用的主要有:加法交换律和结合律、乘法交换律和结合律及分配律、商不变规律等),一定要培养孩子遇题首先考虑能否简算的思维意识并形成习惯。这是很重要的一步。由于小学生存在思维不周全的弱点,一般还应注意指导以下几点: 1.简算不能违反规律。使用运算定律、性质进行简算时,有些题目看起来能简算,但实际上不能。学生对此区分不清易犯错误。如4 1/5÷(?)×1/(?)=4 1/5,是不合理的。
In primary school mathematics, often overlooked by everyone is the calculation of the question, that the most easily calculated questions. In fact, the calculation of the four mixed expression and answer the same problem, but also to think and choose the calculation method. In counseling children to calculate the question, generally want to teach the child to think in this order. That is: First, observe the characteristics, consider the simple calculation method to calculate the problem can not see the problem Even careful observation of the characteristics of the numbers in the formula, we must first consider the use of arithmetic or computing nature of the calculation how easy (the main applications are: Law and combination law, law of multiplication and exchange law and the law of combination and distribution, the law of invariance, etc.), we must cultivate the child problem first consider whether the simple thinking and the formation of habit. This is a very important step. Because of the existence of primary school students thinking is not comprehensive weaknesses, the general should also pay attention to guide the following points: 1. Budget can not violate the law. Using the law of operations, the nature of simple calculations, some questions seem simple, but in fact can not. Students can not make a clear distinction between this. Such as 4 1/5 ÷ (?) × 1 / (?) = 4 1/5, is unreasonable.