Mathematical problem solving is a core goal of schooling worldwide, but many learners are failing to achieve even basic proficiency. Only 69% of 15-year-old students across OECD countries attained at least Level 2 in mathematics in PISA 2022, and the Philippines scored 355 and only 16% of its students reached that baseline (OECD, 2023). Nationally, Filipino Grade 4 learners ranked lowest among 58 countries in TIMSS 2019 (Mullis et al., 2020), and only 17% of Grade 5 learners met the minimum mathematics standard in SEA-PLM 2019 (DepEd, UNICEF, & SEAMEO, 2021), even as the MATATAG Curriculum reached Grade 5 in School Year (SY) 2025–2026. Local Grade 5 learners of San Roque Elementary School in Candelaria, Zambales, struggled most with word problems. This study determined the problem-solving performance and attitudes toward mathematics of these learners before and after interactive mathematics. A one-group pretest–posttest design within an explanatory sequential mixed-methods approach was used from June 2025 to March 2026 with all 33 Grade 5 learners (16 boys and 17 girls). Data came from a 20-item problem-solving test, a 10-item attitude questionnaire, observations, and informal interviews, and were analyzed using mean, Mean Percentage Score (MPS), normalized gain, a paired-samples t-test, and thematic analysis. The mean score rose from 10.00 to 16.39 out of 20, moving the class MPS from 50.00 (Average Mastery) to 81.97 (Moving Towards Mastery), a gain of 31.97 percentage points and a medium normalized gain of 0.64. All 33 learners improved, and the improvement was statistically significant, t(32) = 13.76, p < .001, dz = 2.40. Learners who liked mathematics increased from 11 to 22, and those who liked computer-based mathematics from 10 to 23. Observations showed enthusiasm, self-paced practice, immediate feedback, and growing confidence. Interactive mathematics aligned with classroom lessons was therefore associated with substantial gains in performance and more positive attitudes, although the absence of a comparison group calls for a controlled replication.