This study aimsto: (1) determine the characteristics ofmathematics learningGroup Investigation model with scientificapproach, (2) developa validlearning device, (3) test thepracticality, and(4) test the effectiveness.The studyrefers tothe modeldevelopmentPlomp: (1) PreliminaryInvestigation, (2) design, (3) realization, (4) testing, evaluation, andrevision.First prototype validatedandrevised according toinputinto second prototype.  Validatorthentestedin<