This study is aimed to measure the effectivenessof using flash cards in vocabulary mastery at the third grade students of SDN 1 Tumbang Tahai. The writer used quantitative approach. The design of the study was quasi-experimental design, where the writer used nonrandomized control group pre-test design with a kind of treatment.
The population of the study was the whole students of the third grade students at SDN 1 Tumbang Tahai with the total number of the students were 33 students. They directly becoming subject of study namely III A as experimental group (taught by using flash card) with the total number of 17 students and III B as control group (taught without using flash card) with the total number of 16 students. The sample of study was determined using cluster sampling technique.
The result of t test using manual calculation showed that the calculated value (tobserved) waas greater than ttable at 5% and 1% significance level or 2.042 2.750. The result of t-test using SPSS 17.0 calculation indicated that the calculated value (tobserved) was also greater than ttable at 5% and 1% significance level or 2.042 2.750. This indicated that the alternative hypotheses stating that the flash card increases the students’ English scores for the third grade students at SDN 1 Tumbang Tahai was accepted and the null hypotheses stating that the flash card does not increased the students’ English scores for the third grade students at SDN 1 Tumbang Tahai was rejected.
Based on the results of the study, it was shown that the flash card gives effect in vocabulary mastery at the third grade students of SDN 1 Tumbang Tahai. Because, flash card a visual media that can be interest the student in learning activities, flash card increase students motivation in learning activities, and flash card can keep the students attention during the teaching activity.