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一位教师按教材内容顺序讲述百分数意义之后,出示三道题目给学生讨论、回答: (1)五年级有学生100人,参加课外活动小组的有80人。参加课外活动小组的人数占五年级学生人数的百分之几? (2)四年级有学生200人,参加课外活动小组的有100人。参加课外活动小组的人数占四年级学生人数的百分之几? (3)比较上面两道题目的结果。想一想:这两个结果说明什么问题?
After a teacher tells us the percentages in the order of teaching materials, he presents three questions for students to discuss and answer: (1) There are 100 students in the fifth grade and 80 students in the extracurricular activities group. What percentage of the fifth grade students participate in the extracurricular activities group? (2) There are 200 students in the fourth grade and 100 people in the extracurricular activities group. What percentage of students attend the extra-curricular activities group? (3) Compare the results of the above two questions. Think about it: what are the two results?