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四册教材第三单元“万以内的减法”中安排了“求比一个数少几的数”这类应用题。怎样帮助学生掌握其数量关系呢?有两种思考方法。第一种,假设法“第一行摆10根小棒,第二行比第一行少摆3根。第二行摆了几根?”
Four volumes of textbooks in the third unit “subtraction within the million” arranged for “a few numbers than a few” such application questions. How to help students master the relationship between quantity? There are two ways to think. First, suppose the law “put 10 small sticks in the first row, the second row less than the first row of 3. The second row put a few?”