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This study aimed to improve the students’ vocabulary using English Hello Application. This design were classroom action research with four stages of two cycles. The subjects were 22 students from seventh grade students in a junior high school Sukoharjo. The researchers used three instruments to collect the data which were test, observation sheet, and questionnaire. The result showed that the students’ vocabulary could improve by using English Hello application from cycle I by 51.81 for the mean of pre-test result and 69.54 for the mean of post-test result. Cycle II was 78.63 for the mean of pre-test and 91.81 for the mean of post-test. The result of t-test in cycle I and cycle II were significant. In addition, the minimum completeness score of pre-cycle, cycle I, and cycle II increased significantly. There was a positive response of using English Hello application by most of students chose strongly agree with 8 students in cycle I. It increased in cycle II by most of them who chose strongly agree with 11 students in learning vocabulary using English Hello application.
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