| Summary: | 碩士 === 臺北市立教育大學 === 數學資訊教育學系數學資訊教育教學碩士學位班 === 99 === This study is a remedial teaching of multiplication and division word problems for four mathematic underachivers in fourth grade.The researcher test students multiplication and division of computing power by calculation problems in the first test. And reference to Greer’s (1992) classification model of multiplication problems,to design word poblems in the first test in three types：equal groups,multiplication comparison,cartesian product. Want to know how students solve multiplication and division word problems and concept form the first test.Then, the researcher designed three modules, included eight activities for the difficulties of students. And implement remedial teaching by the strategies of ask and representation.After remedial teaching,the students do the second test. The researcher analyzed the changes of multiplication and division concept of students from the two tests and interviews,to know the remedial teaching improved the concept of multiplication and division of students or not. The results are as follows：
1. The sdtudents with the following characteristics before remedial teaching：
（1）Good basic computing power, but difficult to solve word problems.
（2）Some students is not clear the concept of multiplication and quotitive division.
（3）Profound sense of 「Times is Multiplication」.Could not use division to solving multiplication comparison problems.
（4）The misconceptions of「Multiplication gives the results of larger, smaller division so that the results」.
2. In remedial teaching, the strategies of ask and representation help students to understand the meanings of multiplication and division.Good to improve one-step problems solving,but limited to two-step problems.
3. The concept of multiplication and quotitive division were improved after remedial teaching.Solving one-step and two-step problems successfully. There were still two students could not use division to solve multiplication comparison problems.
Keywords：mathematic underachivers, multiplication and division, word problems, remedial teaching
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