This study aims to study the effectiveness of jumping task application based on creative problem solving in improving students' problem-solving abilities. The study was applied triangulation method, namely qualitative and quantitative methods. The research subject is eighth grade of Junior High School students. The research sample consists of three classes taken by applying cluster random sampling method. The qualitative research sample includes two students from experimental class, determined by purposive sampling based on their most unique answers. Data was obtained from pre-test and post-test on solving a problem sheet and also from an interview result. It implies the student problem solving tests of three classes are differences after the implementation of jumping task based on creative problem solving (CPS). The result of students' work and interview are analysed by qualitative method. It shows that the students' problem-solving abilities in mathematics learning with jumping task based on CPS is better than students' problem-solving abilities in mathematics learning with sharing task based on CPS, and students' problem-solving abilities in mathematics learning with sharing task based on CPS is better than students' problem-solving abilities in conventional model.

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The research conducted was a research on media development in the form of electronic module in mathematics learning using a STEM-Collaborative Project Based Learning model which is believed to improve the mathematical literacy skills of vocational high school students. The test subjects in this study were students of Vocational High School 1 Panji Situbondo where the data analysis technique used in this development research was descriptive analysis techniques. The quantitative data that had been obtained from the Likert scale measurement were converted based on the weighted score that has been determined. This data is quantitative data which were further analyzed by descriptive statistics. The scores obtained from the questionnaire were then converted so that the eligibility percentage was known and the conclusion that the e-module developed was valid, practical and efficient. The benefit that could be obtained from this research was the contribution of thoughts to improve the quality of education, especially in mathematics learning by presenting new insights regarding the preparation of learning tools in the form of e-modules as an alternative to learning media for mathematics to improve the quality of the learning process.

The present study aims to investigate the effectiveness of Research Based Learning (RBL) in improving students' learning achievement in solving two dimensional arithmetic sequence problems. The study applied triangulation method including qualitative and quantitative methods. The research subjects were 4thsemester students of higher education. The quantitative method was applied to analyse the learning achievement test, while the qualitative one was applied in the form of observation and interview. The collected data were analysed by using inferential statistics t-test. The result of t-test indicates that the sig (2-tailed) of independent sample t-test of pre-test is 0.853 (p>0,05), thus it is not significant. It implies the two classes are homogeneous in term of student achievement test. The data analysis of independent sample t-test of post-test, the sig (2-tailed) is 0.00 (p=<0,05), thus it is significant. It implies that the student achievement tests of two classes are different after the implementation of RBL. It shows that the students' achievement result of experimental class is better than the control class. The implementation of RBL is proven effective in improving students learning achievement in solving two-dimensional arithmetic problems.

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