Journal of Education, Teaching and Learning Volume 2 Number 1 March 2017. Page 47-52 p-ISSN: 2477-5924e-ISSN: 2477-4878 47 Developing Instructional Mathematical Physics Book Based on Inquiry Approach to Improve Students’ Mathematical Problem Solving Ability Syarifah Fadillah 1) , Wahyudi 2) , Dwi Fajar Saputri 3) 1) IKIP PGRI, Pontianak,Indonesia E-mail:atick_fdl@yahoo.co.id 2) IKIP PGRI, Pontianak,Indonesia E-mail: wahyudi.kakap@gmail.com Abstract.The problem in this research is to know how the process of developing mathematics physics instructional book based on inquiry approach and its supporting documents to improve students' mathematical problem-solving ability. The purpose of this research is to provide mathematical physics instruction based on inquiry approach and its supporting documents (semester learning activity plan, lesson plan and mathematical problem-solving test) to improve students' mathematical problem-solving ability. The development of textbook refers to the ADDIE model, including analysis, design, development, implementation, and evaluation. The validation result from the expert team shows that the textbook and its supporting documents are valid. The test results of the mathematical problem-solving skills show that all test questions are valid and reliable. The result of the incorporation of the textbook in teaching and learning process revealed that students' mathematical problem-solving ability using mathematical physics instruction based on inquiry approach book was better than the students who use the regular book. Keywords: Instructional Book;Mathematical Problem Solving Ability; Inquiry Approach I. INTRODUCTION The curriculum at IKIP PGRI Pontianak requires the students of Physics education program to master some basic physics courses, one of which is mathematical physics. In learning physics, the students are required to master mathematics, this is because in learning physics the students are not only required to learn the concept of physics but also required to formulate a mathematical concept formulated in the form of a mathematical law or formula. In addition, students also learn how to use math to discuss physics problems. Wanhar [1], states that mathematics plays a main role in physics, to solve physics problems from the simple to the most complex. In addition, mathematics is also very helpful in reasoning someone in tracing the complexity learning physics. Nevertheless, the students consider mathematical physics as one of the difficult subjects. This is shown from the results of the final examination of mathematical physics course given to students of IKIP-PGRI Pontianak in the academic year of 2010/2011 with an average score below 60, as well as in the academic year of 2011/2012 the average scores below 65. From these two sets of data it can be seen that the percentage of students who have difficulty working on mathematical physics problems is still quite large, especially on the question that requires a mathematical concept; for example, in kinematics material with vector analysis, in learning the concept the student experienced difficulties to solve the problems because they did not master integrals and derivatives. In fact, this course is a prerequisite course for students to take the next courses including modern physics courses, statistical physics, and quantum physics. Based on the results of interviews with physics lecturers and some students of Physics education study program, it is revealed that the students' difficulties in studying mathematical physics due to the low ability of problem-solving mathematics. The results of the researchers’ initial tests on students’ mathematical problem-solving skills showed that most of the students were still difficult in solving mathematical problems. The mistakes made by students include: (1) 29% of students could not identify the data or information needed to solve mathematical problems, (2) 61% of students did not use effective strategies and lead to solutions to solve mathematical problems, and (3) 83% of students did not provide an explanation of the strategies, related concepts, and mathematical procedures; not using mathematical representations to solve problems and did not interpret and communicate solutions of mathematical problem solving obtained. The low ability of mathematical problem solving caused by several factors, among others, lecturers still use lessons with lectures and less independent in learning. The lessons used by the lecturer with the sequence explaining, giving examples, asking questions, exercises, and assigning mailto:atick_fdl@yahoo.co.id mailto:wahyudi.kakap@gmail.com Journal of Education, Teaching and Learning Volume 2 Number 1 March 2017. Page 47-52 p-ISSN: 2477-5924e-ISSN: 2477-4878 48 tasks to make the students accustomed to accept the concept directly from the lecturer without trying to find out the process of finding the concept. Therefore, it is required a learning model that can improve students’ independence learning and train students in solving problems that require mathematical concepts. According to Santyasa [2] the efforts to improve the quality of process and learning outcomes are through the implementation of constructivist learning paradigm. The change in the paradigm of learning leads to a change of learning focus from learner-centered learning into student- centered learning. Learning conditions that make the students only receive the material from the teacher, record, and memorize it must be converted into knowledge sharing, inquiry, find knowledge actively so that there is an increase of understanding not memorizing. In addition, learning based on constructivist paradigms focuses on solving problems, developing concepts, constructing solutions and algorithms rather than memorizing procedures and using them to get one correct answer. The appropriate approach for this demand is inquiry approach. An inquiry approach is a form of teaching that emphasizes the active role of students both physically and mentally in the learning process. Kindsvatter, Wilen, and Ishler in Suparno [3] explain that inquiry is a teaching model that involves students' critical thinking skills for systematically analysing and solving problems. Through inquiry, can train students ability in solving problems both in solving problems and problems encountered in everyday life. Several studies have shown that the inquiry approach is well applied in learning. Brickman, et al [4] suggests that the inquiry approach can develop student skills, increase self-confidence and scientific skills. In addition, McBride, et al [5] found that physics teachers were more successful in teaching their students through an inquiry approach. Kurniawati, et al [6] showed that mastery of concept and critical thinking ability of students who learn with inquiry learning guided peer instruction integration higher than conventional learning. Similarly, Wahyudin, et al [7] concluded multimedia-assisted learning using guided inquiry can increase students' interest and understanding. This study uses an inquiry approach to improve students' mathematical problem-solving skill in mathematical physics course. To carry out teaching and learning process using inquiry approach, a textbook that is oriented to the approach is needed. Therefore, this research aims to develop a textbook of physics mathematics-based inquiry approach, in order to improve students' mathematical problem-solving skill. Besides developing textbooks, this research also develops supporting documents such as Semester Learning Activity Plan (SLAP), Lesson Plan (LP), and Mathematical ProblemSolving (MPS) test. II. RESEARCH METHOD This research is a research and development approach (R & D) which aims to develop a product of physics-based mathematics instructional books inquiry approach. The textbook development process uses the ADDIE model consisting of four stages: analysis phase, design stage, development, and production stage, implementation stage, and evaluation stage [8]. This research uses descriptive, evaluative, and experimental methods. Descriptive methods are used to describe the initial analysis of existing conditions. Evaluative methods are used to evaluate the product validation and testing process. The experimental method is used to test the efficacy of the resulting product. The sample of this research was two classes of Physics education study program of IKIP PGRI Pontianak selected as control class (Class A) and experiment class (Class B). For the experimental class, it is done using mathematical physics instruction based on inquiry approach. While the control class using Mathematical Physics textbook which was not based on inquiry approach. In the analysis phase, it describes the needs analysis of textbooks. From the results of preliminary studies on the need for textbooks to improve the problem-solving skills of mathematics has taken the action of designing textbook of mathematical physics based on inquiry approach. At this stage of design is also designed supporting document for a textbook. Furthermore, after going through the stage of analysis and design, the next stage was the development stage. At this stage, it is described the quality of physics- based mathematics instruction book based on an inquiry approach assessed by a team of experts and improvements made by researchers based on experts input. The aspects assessed from the textbook consist of five such as: (1) the accuracy of the scope of the content, including the suitability of the textbook content to the purpose of the lecture to be achieved, and the breadth or depth of the textbook content, (2) the textbook digestibility, Systematic, orderly and consistent format, (3) language usage, such as language or editorial used in clear, proper, and communicative textbooks, (4) the appearance of the textbook, and (5) the use of clear illustrations and right. In addition to being asked to assess the quality of textbooks, the experts were also required to assess the quality of SLAP and LP. SLAP and LP were arranged based on course with reference to the standard format established by the instructional analysis development centre. Assessment in SLAP consists of five aspects: (1) development of the course identity, (2) development of learning activities, (3) time allocation, (4) library resources, and (5) language use. Aspects of assessment for the LP were four aspects: (1) development of expected end-capabilities and indicators based on inquiry approach, (2) development of inquiry-based learning activities, (3) development of assessment based on inquiry approach, and (4) LP.The assessment of each aspect in textbooks, SLAP and LP was done using Likert scale, namely SB (very good), B (good), C (enough), K (less) and SK (very less). Very well worth 5, good 4, enough 3, less 2, and very less 1. Next is calculated the average value of each aspect assessment of all expert team assessment and categorized with the provisions: the value of textbook quality /SLAP/LP was very good if 4