The process of mathematical thinking in learning mathematics is very important. One internal factor that affects it is cognitive style. The purpose of this study is to describe how each student’s cognitive style performs mathematical thinking processes. The types of cognitive styles studied are field dependent (FD) and field independent (FI). This research is a literature study by examining journals related to cognitive style and students’ mathematical thinking abilities. The results of journals review show that students with FI cognitive style analyze and orient analytically to process information and are able to process information using mathematical notation and their own language, and are able to model problems using image visualization. Students with FD cognitive styles adopt a global orientation to understand and process information. In solving mathematical problems, students with FI cognitive style were better than students with FD cognitive style.

This research type was research and development which is conducted at SMP Negeri 8 Tarakan at VII class in Academic Year 2018/2019. The objective  of this research was to develop the  pocket book based on local wisdom as a learning source on number material that was suitable and practical for the seventh grade students of SMP Negeri 8 Tarakan.The development model used was ADDIE model modification. The ADDIE model consists of five stages that were consisted of: Analysis, Design, Development, and Evaluation. However, because of limitation time and limitation of the research objectives, so the researcher modified the ADDIE model modification by limiting the stage only in development stage. The product testing stage through two stages those were expert assessment and user response. In expert assessment was validated by the material experts, display experts and linguists. In the small group trials was carried out by 2 mathematics teachers and 6 students. On the field trial carried out by 26 students.The result of analysis shows that the product of pocket book based on local wisdom was developed based on validation by the material experts got a very suitable category with the percentage of 85.71%, display experts got a very suitable category with the percentage of 86.25% and linguists got a very suitable category with the percentage of 85 %. Whereas based on the result in the field by the responses of student users got the percentage of 83.5% with a very practical category. Because the pocket book already fulfilled the suitable and practical requirements which consisting of aspects of the content or material feasibility, display feasibility, language feasibility, and practicality of user responses, so  pocket book based on local wisdom can be used as a learning source on number material that suitable and practical for seventh grade students of SMP Negeri 8 Tarakan

The purpose of this research was to produce the application of “Matbel Legenda” with computer based which was worthy as mathematics learning to grow the feeling of loving the homeland of VIII graders in SMP Negeri 7 Tarakan on Teorema Pythagoras materials. The type of this research was Research and Development (R D) which was conducted at SMP Negeri 7 Tarakan in class VIII. The development model used was ADDIE model. Overall, ADDIE model consists of 5 stages. The stages are started from Analysis, Design, Development, Implementation, and Evaluation. The development stage was conducted by making the learning media “Matbel Legenda”, validated by the content expert, learning design expert, language and culture expert, media expert, and the testing was conducted in 2 stages with small group test which consisted  of 6 students as the subjects and field test which consisted of 28 students as the subjects.The analysis showed that the learning media “Matbel Legenda” which was developed based on the validation of content expert got average score of 3,5 with very good category, the learning design expert got average score of 3,4 with very good category, the language and culture expert got average score of 3,8 with very good category, and the media expert got average score of 3,4 with very good category.  Furthermore,  the  result  from  field  test  for  “Matbel  Legenda”  had fulfilled the requirements as a product that was easy to operate, easy to learn, and has attractive appearance. The “Matbel Legenda” learning media based on computer to grow the students’ feeling of loving the homeland has an analysis result as Normalized gain of 0,6 with medium category.  Because of that, the “Matbel Legenda” learning media was worthy to be used as additional learning media to grow the feeling of loving the homeland of VIII graders in SMP Negeri 7 Tarakan.

Proportional reasoning is the important process in solving social arithmetic problems. A students’ successes in solving mathematical problem is also determined by affective abilities, one of which is a mathematical disposition. This study aims to describe the students’ proportional reasoning in solving non-routine problems based on mathematical disposition. This research is a qualitative study by conducting an in-depth analysis of the proportional reasoning ability of students in students with high, medium, and low mathematical dispositions. The research instrument used was a problem solving ability test, a mathematical disposition scale, and an interview guide. The result shows that in solving non-routine problems, students with high mathematical disposition have mathematical reasoning abilities at level five (Functional and Scalar Relationships), students with moderate mathematical disposition at level four (Accomodating Covariance and Invariance), and students with low mathematical disposition at level five one (Qualitative). Thus it can be concluded that the higher the mathematical disposition of students, the proportional reasoning in solving non-routine problems will be better.