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一步计算的比差应用题有三种类型:①求两数差;②求比一个数多几的数;③求比一个数少几的数,其中求两数差是基本应用题。教学这一类型基本题,必须要术学生理解求一个数比另一个数多几或少几的效就是求两个数的差,要用减法计算,但与总数减去部份数等于剩余数的数量关系不同。本文就这一内容的教学,谈两种不同的理解思路。以教材例题说明两种思路的思考方法: 学校里养了7只黑兔,12只白兔,白兔比黑兔多几
There are three types of application of the step-by-step comparison of the difference: ① find the difference between two numbers; ② seek a few more than a number of numbers; ③ seeking a few numbers than a few, which asked the difference between the two is the basic application of the problem. Teaching this type of basic questions, you must surgery students to understand how to find a number more or less than the effect of another number is the difference between the two numbers, using subtraction, but with the total number minus the number equal to the remaining number The number of different relations. This article on the content of teaching, talk about two different ways of understanding. Example teaching materials to illustrate two ways of thinking: the school raised seven black rabbits, 12 white rabbits, rabbits more than black rabbits