This investigation was motivated by the low levels of critical thinking and desire to know among elementary school pupils. This study describes the disparities in fourth-grade students' comprehension of square and rectangular shapes before and after using the Flipbook-interactive media. The method of investigation employed is quantitative research. This study employs a Pre-test and Post-test design with a control group. This study employed assessments, questionnaires, observations, and documentation for data collection. Statistical analysis consisting of normality tests, homogeneity tests, paired sample t-tests, independent sample t-tests, and ANOVA tests was used to perform data analysis techniques. The study results showed that students' critical thinking skills obtained a sig. of 0.000 > 0.05, Ha is accepted, and Ho is rejected, so students' critical thinking after using the Flipbook-interactive media is better than before using it. In the discovery learning paradigm with Flipbook-interactive media, students have a more inquisitive disposition than before. Meanwhile, critical thinking skills and a desire to know obtained F 2.916 with a sig. equal to 0.000 > 0.05, then Ha is accepted and Ho is rejected, so critical thinking skills and desire to know are better after using the Flipbook-interactive media than the cooperative model with visual media.