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苏教版教材五年级下册第七单元“解决问题的策略”中的例2主要引导学生借助几何直观将一类分数连加式题转化成相对简单的分数减法式题进行计算,帮助他们进一步积累转化的经验,感受转化策略的价值。应该说,教材的编写意图十分明显,随后的练习也不是让学生一味地模仿,而是注意通过不同连加式题的转化引导他们不断感受相关策略的普遍意义。实际教学时,笔者发现不少教师为了让学生更加熟练地掌握类似教材例2中分数连加式题的计算方法,将上述式题的计
Sujiao version of the fifth grade textbook Seventh Unit “Problem Solving ” in Example 2 mainly to guide students through the use of geometric intuition will be a class of fractional addition formula into a relatively simple fractional subtraction formula to calculate, help They further build on the experience of conversion and experience the value of conversion strategies. It should be said that the intent of teaching materials is very obvious, and then the practice is not to let students blindly imitate, but pay attention to through the conversion of different conjunctions to guide them to continue to feel the universal significance of the strategy. The actual teaching, I found that many teachers in order to allow students to master more skillfully similar teaching materials in Example 2 in fractional addition formula calculation method, the above formula