In this study, it was aimed to show the effect of computer assisted learning on the academic achievement, performance levels and computer attitudes of 8th grade students in "Transformation Geometry" subject and determine students' opinions about this learning environment. The study was conducted with embedded design, one of the mixed method designs. As a result of the analysis, no statistically significant difference was found between the academic achievement of control and experimental groups. Experimental group students stated that the Geometer's Sketchpad (GSP) software was useful, they expressed that they learnt the subjects better and easier, learning by applying increased their self-confidence and sense of curiosity. It was determined that students were able to establish relationships between the concepts they learnt about real life and the subject of transformation geometry and realized that they could experience mathematical concepts in many areas in daily life.