This study aims to look at the relationship between achievement motivation and vocabulary mastery of exposition writing skills. This research was conducted on 5th grade students of elementary school Semanan 12 Pagi Kali d eres South Jakarta School in 2018 with a sample of 72 students in grade 5 elementary school. The approach used is a quantitative approach with survey methods (correlational studies) that describe the variables studied, while investigating the relationship between variables, including bounded variables (endogenous) and independent variables (exogenous). The results showed that: (1) There was a significant relationship between achievement motivation towards exposition writing ability. (2) There is a significant relationship between vocabulary mastery and exposition writing skills. (3) There is a significant relationship between achievement motivation and mastery of vocabulary towards the ability to write the exposition of 5th grade students in elementary school.
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