Research objectives: (1) to describe the process of learning mathematics by applying the cooperative learning model with Group Investigation Type. (2) to describe the average learning outcomes of mathematics by applying the cooperative learning model with Group Investigation Type. (3) Significantly prove the quality of the mathematics learning process well by applying the cooperative learning model with Group Investigation Type. (4) Proving significantly the average mathematical learning outcomes by applying the cooperative learning model with Group Investigation Type. The results of the study: (1) The quality of the mathematics learning process is good through the application of the cooperative learning model with Group Investigation Type. (2) The average learning outcomes are good through the application of the cooperative learning model with Group Investigation Type (3) The quality of the mathematics learning process is good by applying the cooperative learning model with Group Investigation Type (4) The average mathematics learning outcomes are good by applying the cooperative learning model with Group Investigation Type.