Jenis penelitian adalah penelitian tindakan kelas (ptk). penelitian ini bertujuan untuk meningkatkan hasil belajar ipa materi sumber daya alam menggunakan model pembelajaran kooperatif tipe numbered heads together (nht) pada siswa kelas iva sdn 028 tarakan. penelitian ini dilaksanakan dalam 2 siklus, mulai tanggal 24 mei-5 juni 2013. subjek penelitiannya adalah siswa kelas iva sdn 028 tarakan dengan jumlah 35 siswa, dengan rincian 15 siswa perempuan dan 20 siswa laki-laki. hasil penelitian yang telah dilakukan menunjukkan bahwa terjadi peningkatan hasil belajar siswa. hal ini dapat dilihat dari persentase ketuntasan hasil belajar klasikal pada siklus i sebesar 62,85% meningkat menjadi 80% pada siklus ii. kesimpulan penelitian tindakan kelas ini adalah model pembelajaran numbered heads together ((nht) dapat meningkatkan hasil belajar siswa. kata kunci: hasil belajar, ipa, model pembelajaran numbered heads together ((nht), sumber daya alam

The research design of this research used classroom action research (car). the objective of this research was to improve the students’ achievement on natural resource through cooperative learning type numbered head together (nht) at forth grade students of sd negeri 028 tarakan. based on the preliminary study showed some problems in teaching learning process, namely 1) students had a lack of motivation in learning, 2) students bored toward the teaching activities. the research was done from 24 may to 5 june 2013 in even semester 2012/2013. this research was done into some steps; planning, implementing, observing and reflecting. the research instruments were observation sheet and test. the number of students in one class consisted of 35 students. based on the result of study in first cycle the students’ score was 62.85% and the second cycle was 80% of the percentage of students who gained the minimum score. it indicates that students have gained the criteria of success in this research and the students’ motivation was rising and priding by implementing cooperative learning type numbered head together (nht). by understanding the result of this study, it can be concluded that the cooperative learning type numbered head together (nht) can improve the students’ achievement on natural resource at forth grade students of sd negeri 028 tarakan. keywords: numbered head together, students’ achievement