The aim of this study is to know the effectiveness of word cards for vocabulary mastery. The researcher conducted a pre-experimental group design of one group pretest and posttest. The population of this research is the fourth-grade students of MI Perguruan Mu’allimat Jombang in the academic year 2024/2025. Total of the population was 128 students. The sample in this study was class IV D MI Perguruan Mu’allimat Jombang, totaling 32 students. Based on the data normality test that has been carried out by the researcher, it shows that sig. 2-tailed is 0.162 meaning that the data is normally distributed, then it will be continued with a simple paired t-test. based on the Testing of Hypothesis Terms, If the score of t is sig. <0.05, Ha is accepted and H0 is rejected. on the simple paired t-test calculation, the data shows sig. (2-tail) 0.000. The data is smaller than 0.05, meaning that H0 is rejected and Ha is accepted.
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