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在苏教版六年级数学认识百分数单元教学之后,配套的补充习题中有这样一道数学题:“小芳用3分钟做了48道口算题,做错了5道。小力用5分钟做了70道题,做错了9道。谁的口算正确率高一些?”本题对学生的知识考查点有两个,第一是检验学生的抗干扰能力,看看学生能否排除本题中与最后的问题正确率计算无关的数据;第二则是考查学生是否理解如何计算正确率以及他们能否正确计算正确率。
In the Sujiao version of the sixth grade mathematics to recognize the percentage of unit teaching, supporting complementary exercises have such a math problem: “Xiaofang made 48 mouth maths in 3 minutes, doing wrong 5. Little effort to do with 5 minutes 70 questions, doing the wrong 9. Whose mouth count the correct rate higher? ”The question of students knowledge of two points, the first is to test the students anti-interference ability to see if students can rule out the problem The second is to examine whether students understand how to calculate the correct rate and whether they can correctly calculate the correct rate.