This study aims to increase learning achievement. Especially in Indonesian subjects. This is done because: (1) Indonesian academic achievement from year to year is unsatisfactory, (2) Many students are sleepy during Indonesian lessons, and (3) students are not very interested in Indonesian Language Lessons. This research uses a Classroom Action Research approach. (PTK) with a two-cycle system. The research subjects were fifth grade students at SD Negeri Tiron 01 Madiun Regency. Data collection techniques applied are tests and observations. Data analysis was carried out using a qualitative approach that focused on student achievement, student activity in learning, and learning implementation. The results of the study showed that the learning achievement of the Indonesian language students of class V at SD Negeri Tiron 01 Madiun Regency. Increasing the percentage of classical learning completeness from 83.3% (4 of 9 students) in Cycle I to 51.38% (7 of 9 students) in Cycle II. Student activity in learning also experienced an increase in the percentage of classical student activity from 50.00% (3 of 9 students) in Cycle I to 83.33% (6 of 9 students) in Cycle II. It can be concluded that using wall magazines can improve the learning achievement of fifth grade students. The findings in this study are wall magazines can provide inspiration for students to be able to express their ideas and creativity in written form. Through wall magazines, students can develop their writing potential so that they become better and better quality.

The study aims to explore student errors in integer counting operations. The exploration of student error is focused on concept errors and procedurals implemented class VII Secondary School in East Indonesia. A total of 100 students who participated in the study and they were 13-15 Years old. Each student worked on a matter that had been tested for validity and validity, for 40 minutes. The test given consists of 10 matters with summation, subtraction and mixture counting operating material. Analysis of research data is done by exploring the work results of students then grouping based on the type of student error. The test results data is then identified and classified into the shape and type of error. Based on the results of the study, it suggests that in performing integer counting operations, students are highly likely to commit procedural errors and concept errors. The form of procedural errors that students make is: (1) Less thorough in rewriting the matter, (2) Less Efficacy in calculating summation and subtraction results, (3) Forgot to write down negative signs on summation and subtraction results, (4) Mistake of sequence in performing summation and subtraction operations, and (5) Not Writing answers in full. Whereas the form of concept errors that students make is: (1) Errors in summing negative numbers, (2) Errors in subtraction of similar integers (a-b for a

This Class Action Research was carried out at SMP Negeri 1 Gemarang in class VIII-A students, the research subjects were 22 students. Researchers collected data using qualitative and quantitative techniques. Data collection using qualitative techniques was carried out by way of interviews, observation while data collection through qualitative techniques was carried out by carrying out pre-tests and post-tests so as to produce an average test score. The results of the average score show that there is an increase in students' English-speaking ability; the average score increased from 71.22 in the pre-test to 76.81 in the post-test I and 85.40 in the post-test II. Based on the description above learning by using video media can improve the skills of expressing simple oral descriptive monologues that are acceptable to class VIII-A students of SMP Negeri 1 Gemarang. The findings in this study is that there is a change in student behavior which is more interested during the teaching and learning process. While there were a few weaknesses, namely the students were very enthusiastic but still constrained by shyness and fear, students were busy while practicing dialogue, in general the authors found an increase in speaking skills even though there were a few mistakes in pronouncing English words (mispronounced).