Improving Students Vocabulary Matery in Reading by using Extensive Reading

This research is concerned with how Extensive Reading strategies can improve the learner's vocabulary. In collecting the data, this research used observation and test called quantitative research. Meanwhile, the participants of this research were the first grade of senior high school at SMA Islam Al-Mujaddid. The researcher divided the participants into control group and experiment group to compare the data between those groups. In the experiment group, the researcher asked each of the students to read and translate the materials given where the researcher also gave the scoring based on their ability. It was also she did in the Control group. During the teaching and learning process, the researcher provided strategies on using extensive reading to improve the students' vocabulary mastery in experiment class. However, this trait was not for the control group. After participating in the teaching learning activity, the participants were given the post-test to both groups. The results indicate that students in the experimental group improved their vocabulary mastery. The students were easier to translate, enjoyed the material, and had a chance to choose the topic they like more.