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人教版五年级数学下册课本第八页有这样一道思考题;14、21都是7的倍数,14、21的和是7的倍数吗?18、27都是9的倍数,18、27的和是9的倍数吗?就题中的数字,学生通过分析,解答出来之后,我意犹未尽,心里隐隐感到些许遗憾:时间一长,数字一变,同学们还能迅速做出吗?于是,我大胆地引入字母,获得了令人满意的效果。一、思考题辅导回放师:(出示篇首提到的思考题)我们已经掌握求一个数的因数和倍数的方法,那么,大家一定能做出这
PEP fifth grade mathematics textbook eighth page has such a question of thinking; 14,21 are 7 times the multiple, 14,21 sum is a multiple of 7? 18,27 are a multiple of 9, 18,27 And is a multiple of 9? The questions in the figures, the students through analysis, answer out, I still do not know, my heart faint feeling a little regret: a long time, the number of a change, students can quickly make it? So, I boldly introduced the letters and achieved satisfactory results. First, the question of thinking Counseling playback division: (to produce the first mentioned in the first question) We have to find a number of factors and multiples of the method, then, we will be able to make this