The aim of this research was to find out the effectiveness of flashcard for
students’ vocabulary mastery. The treatment was conducted from 15th of February
up to 23th of February 2016 at SMP GUNUNG JATI KEMBARAN. This method
used in this research was experimental research. This experimental research
involved: experimental class and control class in which each class consisted 26
students. The population of this research was 79 students of the eighth grade on
the SMP Gunung Jati Kembaran and the sample were class 8B as experimental
class and class 8C as control class. Test was used in collecting data, namely pretest
and post-test and the instrument was tried out to part of population to know is
validity and realibility. The test consist of multiple choices items. Statiscal
calculation gave 53,96 as the mean score of pre-test and 75,34 as the mean score
of post-test in experimental class. Meanwhile, the mean score of pre-test and
post-test in control class was 53,69 and 67,61. So, there was improvement from
the pre-test and post-test as many of 22,38 in the experimental class and in the
control class was 13,92. Furthermore, the data was analyzed by using t-test. Based
on the computation, t-test result 3,840 and the t-table was 1,680. It means that ttest
result was higher than t-table ( 3,840 >1,680). It could be concluded that
flashcard is effective for students vocabulary mastery for eighth grade students of
SMP Gunung Jati Kembaran in academic year 2015/2016.