The purpose of this research is to develop the design of the student worksheet Problem-Based Learning to improve the problem-solving ability of eighth-grade junior high school students. This research uses Four-D development model. The development procedure includes four stages: define, design, develop, and dissemination. The subjects of the study were eighth graders of junior high school 9 Yogyakarta, Indonesia. The object of this research is curriculum, student characteristics and evaluation of teaching materials. This research resulted in a) the results of needs analysis of student worksheet Problem Based Learning to improve problem-solving abilities appropriate to the curriculum, student characteristics, learning materials and objectives. b) the results of the Student Worksheet design consisting of the cover, introduction, table of contents, instructions manual, basic competence, supporting information, action steps, and exercise. This research can be continued to develop and dissemination.

A concept of mathematics is one of the essential goals in learning mathematics. Providing an understanding that the material taught to students is not only as a recitation but also as the concept of the subject matter itself. This study aims to develop student worksheet based on realistic mathematical approach. The method used in this study is the stages of 4-D development research which consists of defining, designing, developing, and disseminating. This study employed two data collection instruments. The first is expert validation which was used to measure the validity. Meanwhile the second is questionnaire which was used to measure students’ practicality and to get product development assessment from experts and students. The results showed that the developed worksheet is valid with the validity level of 3.67 for the content aspect, 3.60 for the constructed aspect, and 3.50 for the language aspect. The worksheet was tested to 21 students of grade VII in MTs N 2 Gunungkidul Indonesia. The test results stated that the worksheet received a good response from students. Therefore, it can be used in the process of learning mathematics in class.

The ability of a mathematical connection is one of the skills that must be possessed by students in the learning process of mathematics. Connecting mathematical concepts to gain a meaningful learning. Learning cycle 5E is one of the learning models that could improve students' mathematical connection ability. Student worksheet is a teaching material which is in the form of papers containing a summary of the materials, a guide for independent studying that refers to the basic competencies needed to be achieved. This article aims to develop a student worksheet design that provides an opportunity for students to optimize students' mathematical connection ability in the independent learning process based on the 5E learning cycle model. This research is for the development of the ADDIE model which consists of four stages, which are: analysis, design, development, implementation, and evaluation. This research is only up to the design stage. The subjects of the study are the students of SMP IT-Abu Bakar and MTs Mu'allimat Muhammadiyah Yogyakarta Indonesia. The instruments of the data collecting included interview sheets, document sheets, and description sheets. Interview sheets for retrieving curriculum data and student characteristics, document sheets for evaluating teaching materials, and description sheets for determining students' mathematical connection ability. Data analysis techniques uses qualitative data analysis. This research resulted in the design of student worksheets that fit the characteristics of students, curriculum, and teaching materials as well as packaging it based on the LC 5E model to provide a meaningful learning experience. Student worksheets are designed to facilitate students in learning activities and provide opportunities for students to optimize mathematical connection capabilities that are integrated into the learning model LC 5E.

Mathematics communication is a way of sharing ideas and clarifying comprehension. The Realistic Mathematics Education (RME) approach can improve mathematical communication skills. The student worksheet is used because it is shorter, more comfortable and summarizes the material along with the questions to be able to assist students in the ability of mathematics communication. This study aims to develop teaching materials in the form of student worksheets based on Realistic Mathematics Education Approach to improve students' mathematical communication skills. This research is development research with ADDIE development model, that is analysis, design, develop, evaluation implementation. The subject of this research is the students of the first grade of VII. Instruments used in the form of validation sheet, mathematics communication ability test, and interview guidance manual. The validation sheet is addressed to material experts and media experts. The test to determine students 'mathematical communication skills is done before and after the use of student worksheet so that it is known whether there is an increase in students' mathematical communication ability. Interview guides are conducted with teachers and students to find out the curricula and character of students in the school. Data analysis techniques in this study using data reduction, presentation, and conclusion. The resulting student worksheet design based on the RME approach that matches the characteristics, curriculum, and student tasks. This research can be developed to the stage of development, implementation, and evaluation.

The ability of mathematical representation is very important for someone to help in solving the problem. This type of research is a development research. This article aims to obtain a student workbook design based on Discovery Learning that is oriented towards students' mathematical representation abilities. This research is a research development of Research and Development (R & D) with 4D development model which includes defining, design, development, and dissemination. This study is limited only to the design stage. Subjects in this study are students of junior high school grade VII in central java Indonesia. An instrument used in this study in the form of essay questions, questionnaire and interview guidelines. This research resulted in the worksheet (LKS) design based on Discovery Learning based on the ability of mathematical representation to improve the ability of mathematical representation. The next stage will be the research stage of development and dissemination to produce a valid, practical, and useful worksheet.