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This study aims to analyze the effectiveness of the STEM approach and the scientific approach in learning Trigonometry in terms of students’ mathematical problem-solving ability and self-efficacy. The research employed a quasi-experimental method with a nonequivalent comparison group design. The study population consisted of all Grade X MIPA students at MA Al-Ma’had An-Nur in the 2023/2024 academic year, with the sample taken from classes X MIPA 1 and X MIPA 2. Data collection instruments included pre-test and post-test assessments of mathematical problem-solving ability and a student self-efficacy questionnaire. Effectiveness criteria were based on post-test averages exceeding 75 for problem-solving ability and self-efficacy scores above 72, as well as improvements from pre-test results. Data were analyzed using the t-test at a 5% significance level to determine learning effectiveness in both groups. Differences in students’ initial conditions and treatment effects were examined using Hotelling’s T² and the N-Gain score test. An independent-sample t-test of N-Gain was used to compare the superiority between the two approaches. The results indicated that both the STEM and scientific approaches were effective in improving students’ mathematical problem-solving ability and self-efficacy. The STEM approach significantly influenced both variables and was superior in enhancing problem-solving ability, although not superior in improving students’ self-efficacy.

This study aims to: (1) produce e-LKPD based on problem-based learning oriented to mathematical problem-solving ability and self-confidence of high school students on the material of equations and quadratic functions and (2) describe the feasibility of PBL-based e-LKPD oriented to mathematical problem- solving ability and self-confidence of high school students on the material of equations and quadratic functions seen from the aspects of validity,  practicality, and effectiveness. This type of research is research and development using the ADDIE model (Analysis, Design, Development, Implementation, and Evaluation). The research was conducted at SMA Negeri 1 Malinau with the research subject of class X-3 students totaling 35 students. Data collection was carried out using interview techniques, observation, e-LKPD validation sheets, pretest-posttest, and questionnaires. To determine the validity, the e-LKPD assessment sheet of material and media experts was used, practicality used student and teacher response questionnaires, and effectiveness used mathematics problem solving ability test questions and student self-confidence questionnaires. Data analysis consisted of qualitative data analysis and quantitative data analysis. Qualitative data analysis was conducted by analyzing the results of interviews, observations, and comments or suggestions given to make improvements to the e-LKPD products developed. Quantitative data analysis was conducted by converting quantitative data into qualitative data in the form of certain categories, normality test using shapiro-wilk, t-test with paired samples test, and N-Gain score. The results showed: (1) PBL-based e-LKPDs oriented towards mathematical problem solving skills and self-confidence of high school students on the material of quadratic equations and functions have been produced, (2) PBL-based e-LKPDs developed meet product feasibility, namely valid with excellent categories based on material and media experts; practical with very practical categories based on teacher responses and practical based on student responses; effective on math problem solving skills with classical completeness of 77%, the t-test results obtained a significance value of 0.000 <0.05 which means that there is a difference in the average ability to solve mathematical problems before and after learning using e-LKPD, the N-Gain result is 0.65 with moderate criteria, and effective on student self-confidence with an increase in the average score of each indicator before and after learning,  the N-Gain result is 0.49 with moderate criteria, and the t-test results with a significance value of 0.000 < 0.05.

The research conducted at MAS Daarul Uluum Lido Bogor Jl. Mayjen Hr Edi Sukma KM 22, Ciburuy Village, Cigombong District, Bogor Regency, aims to analyze the level of Mathematical Problem Solving Ability in the Sequence and Series Material of Class 11 at MA Daarul Uluum Lido through Google Form Media. The research method used is qualitative research with the sampling technique used is purposive sampling. The target population in this study were all class 11 students at MAS Daarul Uluum Lido. The accessible population in this study was only class 11 D MIA MAS Daarul Uluum Lido students. The research sample was 6 students, consisting of 2 students with low-level mathematical problem solving abilities, 2 students with medium-level mathematical problem solving abilities and 2 students with high-level mathematical problem solving abilities. The data analysis technique was carried out descriptively qualitatively before and during the field, namely data reduction analysis, data presentation and drawing conclusions and data verification. Based on the results of the study, it can be concluded that students in the low category are 2 students with a percentage of 5.55%, 28 students with a percentage of 77.77% are in the medium category and 6 students with a percentage of 16.6% are in the high category. So the dominant ability of solving mathematical problems in the material of Sequences and series at MAS Daarul Uluum Lido is in the medium category with a percentage of 77.77%.

Lower elementary school students usually have difficulty solving arithmetic puzzles. This is caused by variables inhibiting students, including lack of focus and low motivation to learn. This research was conducted to determine the proficiency of class II students at SD 1 Selojari in answering addition and subtraction questions through the use of narrative questions. The aim of the qualitative method of this research which uses a qualitative descriptive approach is to characterize mathematical problem solving abilities. The technique for selecting subjects in this research is using a purposive sampling technique, which is a technique for determining samples with various specific considerations using 11 class II students at SD 1 Selojari. The data collection techniques used were interview, observation and documentation methods. The data analysis technique uses data collection, data reduction, and drawing conclusions.  The mathematical problem solving ability of second grade elementary school students in addition and subtraction material is quite high, namely 90%, as seen in the students' ability to work on the questions given and get high scores. The results of this research show that one in three students are still unable to solve problem questions and still need help.

This study reviews various literature related to the implementation of game-based learning models in improving students' mathematical problem solving abilities. Game-based learning has proven effective in motivating students, increasing interaction, and developing mathematical problem solving skills. This article presents a summary of key findings from relevant studies, highlighting the application of the strategy and the positive impact that this approach can have in the context of mathematics learning.      

This research aims to produce an Android-based character calculator media for mathematical problem solving abilities in vocational school students' statistics material that reaches the level of validity, practicality and effectiveness. This research uses the Borg and Gall development design model with steps consisting of potential and problems, data collection, product design, design validation, design revision, product testing, and product revision. The subjects in this research were class X students at SMK Negeri 7 Pontianak, consisting of 31 students. The data collection techniques used are indirect communication techniques and measurement techniques with the data collection tools being validation sheets, questionnaires and test questions. The first research result was validation of the calculator media, namely with an average score from the three experts of 87.27% with very valid criteria. Practicality value, seen from the questionnaire scores filled in by teachers and students which were accumulated to obtain a percentage of 96.76% with very practical criteria. Furthermore, effectiveness, seen from the results of students' posttest results, obtained a percentage of 80.64%, with reference to the school's KKM score, namely ≥75, so the average student test results have complete criteria and are classified as very effective. From the validation results, practicality and effectiveness, it can be concluded that the Android-based character calculator media for mathematical problem solving abilities in vocational school students' statistics material is classified as effective to use.  

This study was to find out how the application of the Problem Based Learning (PBL) model to the topic of Colligative Properties in the science program at SMA Negeri 1 Babalan Class XII academic year 2021–2022 would increase students' problem-solving skills and learning activities. Three cycles of action research were used in this study. 32 SMA Negeri 1 Babalan students from the first semester of the academic year 2021–2022 served as the study's subjects. The findings came from watching students engage in learning activities and testing their capacity to solve problems at each stage of the Cycle. The results demonstrated that 1) college students' problem-solving skills improved by implementing the PBL model on the Colligative Properties subject, with average values from Cycles I to II and III of 56, 77, and 87, respectively, while the percentage of classical completion from Cycles I to II and III was 44%, 62,5%, and 87%, with gains from Cycles I to II of 0,083 and from Cycles II to II equal to 0,35; 2). Applying the PBL model to the topic of Colligative Properties resulted in an increase in the students' learning activities, with an average value of 75 in sufficient criteria, 77 in sufficient criteria, and 85 in good criteria from Cycle I to Cycle II and Cycle III, respectively.

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.    

The research method used in this research is descriptive qualitative research and the form of research used is a case study with the subject being students of class X IIS 4 consisting of 30 students. The data collection tool used was a learning style questionnaire, a test of mathematical problem solving abilities in the form of 2 essays, and interviews with 6 students, namely 2 students with a visual learning style, 2 students with an auditory learning style, and 2 students with a kinesthetic learning style. Before being used in this study, the questions were tried out to determine validity, discriminatory power, index of difficulty, and test reliability. From the results of the study it can be concluded that the students' mathematical problem-solving abilities in terms of learning styles in SPLTV material as a whole have a percentage of 65% with moderate criteria. The sub-problems in this study are as follows: (1) The mathematical problem solving ability of students with a visual learning style has a percentage of 64.82% with moderate criteria; (2) Mathematical problem solving ability of students with auditory learning style ability has a percentage of 72.92% with moderate criteria; (3) The ability of students' mathematical problem solving with learning styles has a percentage of 61.72% with low criteria.    

This study aims to determine the effect of a combination of Discovery Learning and Problem Based Learning on the problem solving abilities of class X students at SMA Negeri 9 Malang. The method used in this research is quasi-experimental with a quantitative approach. Data collection techniques used were interviews, problem-solving ability tests, sheet validation and documentation. The results showed that there was a significant influence on the problem solving abilities of students using a combination of Discovery Learning and Problem Based Learning models in biology class X IPA Malang State High School which can be seen from the sig (2tailed) value of 0.002<0.05. The combination of the Discovery Learning model with Problem Based Learning provides opportunities for students to be actively involved in the learning process to solve problems that occur in everyday life starting from finding problems, analyzing problems to drawing conclusions

This study aims to determine the effect of the combination of the STAD learning model with NHT on the problem solving ability of students in class X Mipa 3 and 4 at SMA Negeri 9 Malang with the material being taught is kingdom Monera this research is a qusi-experimental research using a purposive sampling design. The population in this study amounted to 68 students who werea a combination of all class X in the school, while the sample was taken from two classes with 34 participants in the each class. The class was divided into control and experimental classes, where each class used conventional model for the control class and combination of STAD and NHT learning model for the experimental class. The study measures the problem solving ability of students. The data collection teachniques in the study were in the from of problem solving ability tests, observations, interview, documention with instruments in the from of lesson plans, LKPD, LKPD assement rubrics, observation sheets on the implementation of learning implematation plans, and problem solving ability instrument sheets in the from pre-test and post-test essays. Test analysis of research data used inferential statistical analysis with covariate analysis (anacova). The result of the hypothesis test showed that there was a significant effect, namely 0.008 < 0,05 from the learning model combination the STAD and NHT models with the kingdom monera material in class X at SMA Negeri 9 Malang.