“分数”和“比”是两个不同的概念,但是它们之间的联系十分密切,两者可以互相转化,因而有关分数和比的两种应用题可以互相沟通。我在教学中,注意引导学生灵活应用这种联系来理解题意。例如,一本书,读过的页数占总页数的2/3,可理解为读过的页数与没有读的页数的比是2:1,没读的页数与总页数的比是1:3。又如,某生产队男社员与女社员人数之比为5:4,可理解是男社员人数是女社员人数的1 1/4倍,女社员人数是男社员人数的4/5,男、女社员人数各占全队社员总人 “Score” and “ratio” are two different concepts, but their connection is very close, the two can be transformed into each other, so the two questions about the score and ratio can communicate with each other. I am teaching, pay attention to guide students to flexibly use this link to understand the problem. For example, a book that reads 2/3 of the total number of pages can be interpreted as the ratio of the number of pages read to the number of pages not read is 2: 1, the number of pages not read and the total number of pages The ratio is 1: 3. In another example, the ratio of the number of male members to female members in a production team is 5: 4. It can be understood that the number of male members is 1 1/4 times the number of female members and the number of female members is 4/5 of that of male members. The total number of female members of the total members of the team