<![CDATA[Numeracy literacy is an essential competence for solving everyday problems, yet the numeracy literacy of Indonesian students remains low and mathematics learning is still dominated by lectures. This study aims to determine the effect of the Case-Based Learning model assisted by Wordwall media on the numeracy literacy ability of Grade XI students at State Senior High School 1 Batang Toru on the topic of circles. The study used a quantitative approach with a quasi-experimental method and a Nonequivalent Control Group Design. The sample was determined by purposive sampling, consisting of class XI-7 as the experimental class with 35 students and class XI-5 as the control class with 34 students. Data were collected using a numeracy literacy test of five essay items that were valid and reliable, with a Cronbach's Alpha of 0.823. The data were analyzed using the Liliefors normality test, the Fisher homogeneity test, and a separate-variance t-test. The mean posttest score of the experimental class was 94.86, higher than that of the control class at 82.94, with score increases of 28.00 and 13.82 points, respectively. The variances of the two classes were not homogeneous, so the t-test used separate variances. The t-count of 7.134 was greater than the t-table of 1.674 at a significance level of 0.05 and 54 degrees of freedom, so the alternative hypothesis was accepted. Therefore, the Case-Based Learning model assisted by Wordwall has a significant effect on students' numeracy literacy ability.]]>
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