IMPROVING STUDENTS’ VOCABULARY MASTERY THROUGH CONTEXT CLUES IN UNDERSTANDING READING TEXTS BY USING GOOGLE CLASSROOM APPLICATION AT THE GRADE XII MS 2 OF SMA NEGERI PLUS OF RIAU PROVINCE

This article reports on the purpose of the research was to explain whether context clues gives improvement toward students’ vocabulary mastery in understanding reading texts by using google classroom application at grade XII MS 2 of SMAN Plus of Riau Province, with collecting the data, checklists, field notes, and tests were used.  This classroom action research consisted of two cycles constituting 3 meetings for each cycle. The result of this research shows that the students’ vocabulary mastery in understanding reading texts by using google classroom application increased in each cycles. In the first cycle, the percentage of students’ vocabulary mastery by using google classroom application was 80.60%. But, the result was not satisfactory yet. In the second cycle, the increase of students’ vocabulary mastery by using google classroom application  was 90.08%. It means that there is the increase of students’ vocabulary mastery in understanding reading texts  by using google classroom application in second cycles. In conclusion, the use of context clues could increase the students’ vocabulary mastery in understanding reading texts by using google classroom application.