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“比和比例”这一单元,概念多,易混淆。我注意抓住知识之间的联系和区别,组成题组,让学生在比较中学习,收到良好的效果。一、按新旧知识联系组题,进行比较教学“比”时,为了使学生弄清比与除法、分数的联系与区别,编拟如下题组,让学生练习比较: 2.在括号里填上适当的数。 3∶4=( )÷( )=( )/( ) 18∶( )=36∶24=( )/30 ( )∶20=6÷( )=( )/24 3.选择适当的内容,填在括号里。①比的前项( )分数中的分子,比的后项( )除法中的除数。(等于、相当于) ②比的基本性质和分数的基本性质( )。 (类似、相同) ③比与除法、分数既有联系,又有区别。比是( ),除法是( ),分数是( )。
“Ratio and proportion” of this unit, the concept of more confusing. I pay attention to the connection and difference between knowledge to form a group of questions for students to learn in comparison and receive good results. First, according to old and new knowledge linked group title, comparative teaching “than”, in order to make students understand the ratio and division, the score of contact and differences, the preparation of the following group questions, students practice comparison: 2. fill in parentheses Appropriate number. 3:4 = () ÷ () = () / () 18: () = 36:24 = () / 30 (): 20 = 6 ÷ () = () / 24 3. Select the appropriate content, fill in In parentheses. ① ratio of the preceding item () score in the numerator, the ratio of the last term () divisor in the division. (Equal to, Equivalent) ② The basic nature of the ratio and the basic nature of the score (). (Similar, the same) ③ than with the division, the score is both linked, there are differences. The ratio is (), the division is (), the score is ().