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2014年的人教版教材把原来四年级下的“植树问题”移到了五年级上册,原因是四年级下的学生接受“植树问题”太困难了。“植树问题”真有那么难吗?笔者先对学生的原有认知进行了梳理,发现在一年级下册教材中就出现了有关“间隔”的问题。新教材安排在第12页中:我们一共有10个男生,老师让相邻两个男生之间站一个女生。一共可以站进多少个女生?又在学习“9的乘法口诀”后的练习二
The 2014 PEP textbook moved the “tree planting problem” under the previous fourth grade to the fifth grade because the students in the fourth grade accepted the “tree planting problem” too hard. “Tree planting problem ” really so difficult? The author first sorts out the students’ original cognition, and found that in the first grade textbook appeared on the “interval ” problem. The new textbook is arranged on page 12: We have a total of 10 boys, with the teacher holding a girl between two boys. A total of how many girls can stand? Also in learning “9 multiplication formula ” after exercise two