Peningkatan Kemampuan Menalar dan Memecahkan Masalah Matematika dengan Model Inquiry Learning Berbasis Group Investigation pada Siswa Kelas VII Semester 1 SMP Negeri 2 Grobogan Tahun 2014/2015

Abstract

The purpose of this research is to know the improvement of reasoning and resolving mathematics problem ability with Inquiry Learning model based Group Investigation (GI). The study uses classroom action research method carry out two cycles. The subject of research are students and mathematics teacher of VII D grade, SMP Negeri 2 Grobogan in 2014/2015 academic year. The techniques of data collection are observation, test, and document. The technique of data analysis is plot technique, consist of three plot are data analysis, data presentation, and data verificatian. The result of this research shows the increasing of reasoning and resolving mathematics problem ability, it can be shown by 1) the ability to describe problem in a symbolic manner with manipulation symbol, raised up from 31,25% to 80,64%, 2) the ability to understand problem (list of what is known and asked), raised up from 31,25% to 93,55%, 3)the ability to plan solution method of a problem (pattern, framework), raised up from 15,625% to 93,55%, 4) the ability to implement the plan of solution method (work process), raised up from 15,625% to 80,64%, 5) the ability to interpret the solution of the problem, raised up 9,325% to 58,06%, and 6) the ability to take conclusion from mathematics problem (opinion, conclusion), raised up from 6,25% to 58,06%. The research conclude that Inquiry Learning model based Group Investigation (GI) can improve the ability of reasoning and resolving mathematics problem in students of VII D grade, SMP Negeri 2 Grobogan, especially for proportion and scale.