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Behind the importance of a teacher's role in the progress of a nation comes a weighty responsibility. Teachers are expected to be able to master the skills required to make the teacher profession a professional. In Indonesia education systems has been governed the competence that a teacher must maintain his duty while linked to the implementation of a supervision, to which this writing is the answer to the problem. For research methods, researchers use descriptive qualitative methods. Interviews, observation and documentation as data collection. And the miles and hubberman technique as the data analysis technique, with procedure 1) data reduction, 3) data presentation and 4) data verification, 2) powerability and 3) dependability as far as the results of this study are 1) education supervision is the development and monitoring activities that are done to help teachers and educators improve the quality of education, 2) supervision of learning at SDN katulampa 04 times a month, 3) supervision plays an important role in making it easier for teachers to improve teaching ability and reduce barriers to learning.

This research was carried out with the aim of finding out the learning obstacles experienced by students, especially class V students at SD Negeri 3 Air Kumbang, using rank number material. Learning Obstacles are divided into three types, namely ontogenic obstacles, epistemological obstacles, and didactical obstacles. The research method used is a descriptive qualitative method using several instruments including the results of learning obstacle diagnostic tests, material analysis, interviews, lesson plan analysis, and analysis of textbooks used during the learning process. 20 fifth grade students at SD Negeri 3 Air Kumbang were the subjects of this research. In this research, learning obstacles were found which were divided into three categories, namely ontogenic obstacles, epistemological obstacles and didactical obstacles. Ontogenic obstacles can be seen from students' lack of enthusiasm for learning and readiness to learn. Epistemological obstacles can be seen from students' lack of understanding of a concept related to mathematics due to the limited context that students know, as well as didactical obstacles obtained from the learning tools used which can create learning obstacles during the learning process.

This study aims to describe students' learning barriers in solving SPLDV questions based on problem solving abilities. This research uses descriptive qualitative research, and the sampling technique uses purposive sampling technique. This research was conducted at Sungai Kakap 1 Public Middle School, the data used were the results of researchers to clarify students' obstacles in answering questions based on problem-solving abilities with data sources, namely class VIII students of SMP 1 Sungai Kakap. Data collection techniques used measurement techniques, direct communication techniques and indirect communication techniques with data collection tools in the form of test questions, interview guides and documentation. The data analysis techniques used are data reduction, data presentation, and drawing conclusions. In this study it was concluded that the students' barriers in the high group were wrong in determining the formula and wrong in the concept of completion, the students' barriers in the medium group were wrong in determining the formula, discrepancies in using the formula to answer a problem and did not re-examine the answers, and student barriers in the low group were unable to determine the formula and solve the problem on the question then also did not re-check the answer after completing the given question.