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在期末复习阶段,我们常常发现学生在解决某些问题时会群体性地出现某类错误。如复习“异分母分数”时,给学生出了这样一道题:“李阿姨家有块4/5公顷的地,其中的1/3种土豆,1/5种西红柿,其余的种花生,种花生的面积占这块地的几分之几?”课后批改作业时,吓了我一跳!列式为“4/5-1/3-1/5=4/15”的学生比比皆是。全班54个学生,只有9个学生做对了,错误率高达83.3%。后来,我找几个学生问出错原因,他们竟然都说:“太粗心了,没看清题目就做了。”
During the period review period, we often find that students have certain kinds of mistakes when they solve certain problems. Such as the review “different denominator score ”, to the students out of a question: “Aunt Lee Auntie has a 4/5 hectare, of which 1/3 of the potatoes, 1/5 kinds of tomatoes, the rest of the species Peanut, peanut species account for the area of what fraction? ”After class editing homework, scared me! Column type is“ 4 / 5-1 / 3-1 / 5 = 4/15 Students abound. The class of 54 students, only 9 students did right, the error rate as high as 83.3%. Later, I asked several students to ask the reason for the error, and they even said: ”Too careless, did not see the problem was done. "