Mostoles, R. Integrating Numeracy and Literacy Across the Curriculum: Challenges Encountered by Elementary Teachers of Osmeña Colleges in Promoting 21st-Century Skills, Personal Qualities, and Learner Competencies. IJSAIR 2026, 2 (2), 1849-1855. https://doi.org/10.65339/ijsair.V2.I2.392.