<![CDATA[This study is motivated by the low environmental literacy and academic achievement of elementary school students. The study aims to measure the effect of Android-based STEM-AR on students' environmental literacy. A quantitative research method with a One Group Pretest-Posttest Design was used. A total of 31 fifth-grade elementary school students in Yogyakarta, Indonesia, were randomly selected from nine public schools. The research instruments included a lesson plan and an Augmented Reality (AR) medium accessible via Android smartphones. STEM was used as a reference for structuring subject matter. The treatment was conducted four times, each lasting 70 minutes. Students' environmental literacy was measured before and after the treatment using a validated multiple-choice test. Data analysis employed a t-test with a 5% significance level. The Paired Sample Test results showed a sig(2-tailed) value of 0.001 0.05, which led to the rejection of the null hypothesis and acceptance of the alternative hypothesis. This study contributes to proving that Android-based STEM-AR positively influences elementary school students' environmental literacy.]]>
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