Wafidin, G. 2017 : The Influence of Group Investigation (GI) Learning with Metacognitive Strategies on Mathematical Problem Solving ability at Junior High School Students Counselor : 1. Dr. Hj. Heny Sulistyaningrum, M. Pd. 2. Tanti Nawangsari, S.Si., M. Pd. Keywords : Group Investigation Learning (GI), Metacognitive Strategy and Student Mathematics Problem Solving Ability The problem …