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起因:在观摩“周期规律”教学时,笔者经常发现:几乎每个教师都教得非常轻松,每个学生都学得非常顺畅,无师自通。笔者常想:这个内容如果老师不教,学生能自主找到规律吗?能自主解决有关的简单问题吗?于是,笔者进行了调查。用的题目是教材中“练一练”中的习题(如下),时间是6分钟,学生独立完成,当场收卷。按照规律在括号里画出每组的第32个图形。(1)△○口△○口△○口……()……(2)○○○口○○○口……()……(3)△△△○○△△△○○…()……结果:全班44名学生中38人做对,约占86.4%,而且均用除法计算,都是根据余数确定第32个图形的形
Cause: While observing “periodic law ” teaching, I often found that: almost every teacher taught very easily, each student has learned very smoothly, no self-taught. I often think: This content if the teacher does not teach, students can find their own laws? Can self-solve the simple question? So, I conducted a survey. The topic is used in the textbook “practicing a practice,” the exercises (below), the time is 6 minutes, the students complete independently, on the spot winding. Draw the 32th figure in each group in parentheses. (1) △ ○ 口 △ ○ 口 △ ○ 口 ... () ...... (2) ○○○ 口 ○○○ 口 ...... () ...... (3) △△△ ○○ △△△ ○○ ... ( ) Results: 38 of the 44 students in the class were right, accounting for 86.4% of the total, all of which were divided by the remainder of the calculation, all based on the remainder to determine the shape of the 32nd figure