UPAYA MENINGKATKAN KEAKTIFAN DAN PRESTASI BELAJAR MATEMATIKA MELALUI PEMBELAJARAN KONSTRUKTIVISME SISWA KELAS VIII SMP NEGERI 6 KEBUMEN

The objectives of this research is to discribe learning process by using constructivism learning model in order to improve the activity and achivement of Mathematics Learning in VIII G class of SMP Negreri 6 Kebumen Academic Year 2013/2014.This kind of research is classroom action which is done collaboratively between the researcher and Math’s teacher. The result of research shows that after applying the constructivism learning model, students activity and learning achievement of mathematics is increase. Learning activity is increase from pre cycle 24, 60%, in cycle I becomes 45,31%, and in cycle II becomes 66, 59%. Learning achievement is also increase seen from average value in pre cycle amount to 61,65, in the last of test of cycle I becomes 68,91, and becomes 76,72 in the last of cycle II test. Students percentage which obtain value (73) is increase from 43,75% in pre cycle, in the last of cycle I test becomes 53,12% and becomes 62,5% in the last of cycle II. So, it’s suggested to teacher to be able to choose and apply the suitable learning model in order to create the atmosphere of exciting, condusive, effective in the classroom so they are able to increase activity and mathematics learning achievement and one of them is by using constructivism learning model