This research is motivated by the problem found by researchers at SDN 3 Pematang Tahalo, namely the low ability of students in understanding concepts in Mathematics learning. This study aims to see the effect of the M-APOS Learning Model on the Ability to Understand Mathematical Concepts of Grade V Students at SDN 3 Pematang Tahalo. This research is a quantitative study with a population of all grade V students at SDN 3 Pematang Tahalo. This type of research uses a quasi-experimental, Only Posttest Control Group Design research design, so that the posttest instrument will be given to the control class and the experimental class. This research was conducted at SDN 3 Pematang Tahalo using a sampling technique, namely the total sampling technique. The sample of this study consisted of two class groups, namely the experimental class, namely class V A and the control class, namely class V B. This study used data collection techniques in the form of interviews, essay tests, and documentation. Based on the data analysis that has been done, the results of the study based on the results of the t-test (Independent Samples T-Test) calculation are in accordance with the decision of the data analysis technique used in this study with a significance level of 5% (0.05) at a sig. value. (2-tailed) < 0.05 (0.016 < 0.05), it can be concluded that H0 is rejected and H1 is accepted with the statement that there is a significant influence of the M-APOS learning model on the mathematical concept understanding ability of fifth grade students at SDN 3 Pematang Tahalo.
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