The objective of this research is to find out if using flashcards can improve the student’s vocabulary mastery in junior high school. This research used a quasi-experimental research design. The population of this research was the seventh grade students of SMPN 1 Lore Timur. The sample was selected using the purposive sampling technique. The sample of this research were 53 students, which were divided into 27 the students of class D as an experimental group and 26 students of class A as a control group. The data were collected through the test that consisted of pre-test and post-test. By applying the independent t-test, the researcher found there is no significant difference between the experimental and control groups (p = 0.147, p > 0.05). Thus, the hypothesis was rejected, using flashcards can't improve the student vocabulary mastery in seventh grade at junior high school.
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