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小学数学教材中,有一类关于数字推理的思考题。所谓数字推理,就是指在一些算式中,含有一些待填的数字,通过题目中暗含的线索或规律,进行数字推理,填出能使算式成立的未知数字。练习这类题目,能使学生更加深刻的理解和巩固四则运算法则,对培养学生的逻辑思维能力和数学思维能力颇有益处。这类题目有一定的难度,有些学生一看到这类题就头痛,感到无法下手。为防止学生做题胡猜乱凑,教师应教给学生正确的分析推理方法。笔者现就此问题,谈谈这类思考题的思考方法和判断方法。
Primary mathematics textbooks, there is a class of thinking on the number of reasoning questions. The so-called numerical reasoning, refers to some formulas, contains some numbers to be filled, through the subject implied clues or laws, numerical reasoning, fill out the formula can make the unknown number. Practicing these kinds of topics will enable students to understand and consolidate the four algorithms more profoundly, which is beneficial to students' ability of logical thinking and mathematical thinking. Such topics have a certain degree of difficulty. Some students feel headaches when they see such questions. In order to prevent students from doing guessing, the teacher should teach the students correct analysis of reasoning methods. The author is now on this issue, talk about such thinking questions thinking and judgment.