Abstract
This study aimed to examine what effects the lessons based on some mathematical tools have on the students' interest and problem solving ability. For this study, 2 classes of 5th graders who go to an elementary school were chosen and divided into an applied class and a comparative class. The applied class were taught through the lesson plans based on the mathematical tools and reorganized worksheets, and the comparative class were taught through the regular lesson plans based on the text. After conducting the lessons, examinations were implemented to check out the students' interest level and problem solving ability in the procedure of before-exam, during-exam, and after-exam.
