The four skills needed in the 21st century are often abbreviated as 4Cs, including communication skills. This research is an attempt to determine students' mathematical communication skills and student responses in learning mathematics. The purpose of this study was to determine the significant improvement in communication skills and to determine student responses to the implementation of accelerated learning. This research uses Quasi Experimental Design with Non-equivalent Control Group Design. Pretest and Posttest in the form of quantitative data in the form of description questions and non-test (questionnaire) in the form of qualitative data. The research was carried out at SMPN 4 Purwadadi with the research population in the odd semester of the 2021/2022 academic year. Sampling using purposive sampling method. The instruments used are test and non-test instruments. The test instrument for students' mathematical communication skills is in the form of description questions and nontest in the form of student response questionnaires. The results of the study by using inferential statistics with a significance level of 5% showed that there was a significant difference regarding the improvement of students' mathematical communication skills and the good response of students to the use of accelerated learning.
Mathematical reasoning ability is a vital aspect that must be possessed by students in understanding mathematical problems. With the ability to reason students can analyze new situations, make logical assumptions, explain ideas and make conclusions. Mathematical reasoning abilities can be developed using learning models that are able to open students' horizons. However, in the midst of the COVID-19 pandemic, there are limitations in terms of the learning process, thus distance learning based on e-learning is one of the choices of learning models that can be applied in schools. This study will discuss whether there are differences in students' mathematical reasoning abilities between before and after e-learning-based Distance Learning. In this study using ex post facto research methods, where the population in this study were all class VII students of MTs Ma'arif Bugel An-Nur in Indramayu with the research sample being class VII A students. The research instrument used in this study was a test of reasoning ability. mathematics (pretest and posttest) and non-test in the form of a mathematical disposition questionnaire. The collected data were analyzed using SPPS Statistic 20 software and Ms. Excel. Analysis of the data used was the Wilcoxon test from the results of the pretest and posttest with a significance level of = 0.05 and it was concluded that there were differences in mathematical reasoning abilities between before and after distance learning based on e-learning. Meanwhile, the analysis of the questionnaire data shows that almost half of the students have a mathematical disposition after participating in e-learning-based Distance Learning.
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