This study was conducted at MTs Darul Hikmah, Pekanbaru in the second semester of the school years 2010/2011. The subject of the research is students of class VIIB3. There are 32 students in that class, consisting 32 boys who have heterogeneous academic ability. The goal of this study is to improve students’ mathematics achievement, especially in geometrical (rectangular, square, parallelogra…