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苏教版五年级上册“列举的策略”单元,通过典型且富有变化的实际问题,如22根1米长的木条围长方形花圃、4支球队进行单循环比赛的总场次等,引导学生逐步体会列举策略的价值和方法。学生通过例题的学习及练习,多次经历运用列举的策略分析和解决问题的过程,能逐步学会不重复、不遗漏地进行列举,增强列举的策略意识,培养思维的条理性。笔者在学生的练习中发现,部分学生对“用小棒围长方形时面积的情况”和“用小正方形拼长方形时周长的情况”有时感到疑惑。怎样引导学生准确把握问题情
Supiao version of the fifth grade on the book “enumerated strategy ” unit, through the typical and changing practical problems, such as 22 1 m long rectangular fence garden, four teams to participate in the single cycle of the total number of games, Guide students to gradually appreciate the value and method of enumeration strategy. Students through examples of learning and practice, many experience using the enumerated strategy analysis and problem solving process, can gradually learn to repeat, omit to enumerate, enhance enumeration of strategic awareness, to develop the rational thinking. The author found in the practice of students that some students are sometimes confused about “the situation when the area is rectangular with small rods” and “the situation when the square is small with rectangular shapes”. How to guide students to accurately grasp the problem of love