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This research aims to determine the analysis of students' mathematical critical thinking abilities based on questions based on TIMSS VIII SMP Negeri 29 Medan. This research is descriptive qualitative research. The subjects in this research were 33 students in class VIII-7 of SMP Negeri 29 Medan. The results of the research show that: (1) The average value of students' interpreting abilities is 76.01, which indicates that students' interpretation indicators are in the high category. (2) The average student score in analyzing the mathematical critical thinking ability test is 64.39, which shows that the students' analysis indicators are in the medium category. (3) The average score of students' abilities in the evaluation indicators on the mathematical critical thinking ability test is 41.48, which shows that the students' evaluation indicators are in the low category. So it is concluded that students with high abilities are only able to fulfill 2 critical thinking indicators, namely interpreting and analyzing indicators, 2 students with moderate mathematical abilities are only able to fulfill 2 critical thinking indicators and students with low mathematical abilities, there is 1 student only fulfilling 1 critical thinking indicator in One of the question numbers is the evaluating indicator in question number 3.

The use of learning media that is less than optimal is the basis of this research with the aim of developing learning media for Android applications and knowing the process of student answers. This type of research is development research with a model adapted from Borg and Gall with a  sample of class VIII-2 students of Santa Maria Private Middle School Medan, totaling 25 people. From the results of the study, it was obtained (1) the quality of the developed learning media met the valid, practical, and effective categories with an assessment by media experts of 3.82 and material experts of 3.87, practicality from the student response with a score of 3.61 and the teacher's response with a score of 4, and the effectiveness of classical student learning completeness reaches 92% of students and an n-gain score of 0.62 which means an increase in mathematical visual abilities is included in the moderate category. (2) The process of student answers shows that students have been able to identify problems, understand problems, generalize patterns and explain what is obtained, which means that students have fulfilled each indicator of mathematical visual ability, namely looking, seeing, imagining, showing and telling.

This study aims to determine : (1) The effect size of using mathematic learning media to students’ mathematical abilities as a whole, (2) The effect size of using mathematics learning media to students’ mathematical abilities based on level of education, (3) The effect size of using mathematics learning media to students’ mathematical abilities based on learning media used, (4) The effect size of using mathematics learning media to students’ mathematical abilities based on subject matter, (5) The effect size of using mathematics instructional media to students’ mathematical abilities based on quantified mathematical ablility. This research used meta analysis method. The sampling technique used purposive sampling and obtained 17 research that fit the criteria. Data collection techniques used documentation with the support of software publish or perish. The results of data analysis showed that : (1) Overall using the learning media has a large effect to students’ mathematical abilities as a proportion 0,972, (2) Based on level of education, the use of learning media has a largest effect size if applied at SMP/MTs as a proportion 1,039 (n=16, SD=0,754), (3) Based on learning media used, the visual media has a largest effect size to students’ mathematical abilities as a proportion 1,003 (n=13, SD=0,641), (4) Based on material that is taught, the use of learning media on a branch of logic material has a largest effect size to matematical abilities as a proportion 1,237 (n=2, SD=0,489), (5) Based on quantified mathematical abilities, the use of learning media has a largest effect size to students’ reasoning abilities as a proportion 1,303 (n=3, SD=0,353).