<![CDATA[This research developed a sound waves e-book structured around the Relating, Experiencing, Applying, Cooperating, and Transferring (REACT) strategy and evaluated its feasibility, practicality, and effectiveness in supporting high school students’ numerical literacy and critical thinking. The study followed the ADDIE research-and-development model. Product feasibility was reviewed by four university experts and three physics teachers; empirical instrument testing involved 324 students, and practicality was evaluated by three teachers and 72 students. A quasi-experimental pretest–posttest field study involved 90 Grade XI students in three intact classes: an e-book plus REACT group, a worksheet plus REACT group, and a presentation-based expository instruction group. Expert assessments classified the product as feasible and user responses classified it as practical. Mean numerical literacy scores increased by 18.00, 14.00, and 10.56 points, respectively; critical thinking scores increased by 17.00, 13.30, and 9.80 points. Repeated-measures analyses indicated significant time-by-group interactions for numerical literacy, F(2,87) = 20.548, p < .001, partial η² = .321, and critical thinking, F(2,87) = 22.135, p < .001, partial η² = .337. The largest descriptive gains occurred in the e-book group, although the design and available pairwise tests do not isolate the e-book’s causal contribution. The findings provide preliminary, context-specific support for the developed resource and identify directions for further validation.]]>
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