Recent studies in psychology emphasize the pivotal roles of adopting a growth mindset to enhance students' motivation and employing effective memory strategies to improve memory performance. This study evaluated the impact of a metacognitive intervention that combined the promotion of a growth mindset with the teaching of efficient learning strategies. Using a pre-post experimental design with fourth- and fifth-graders, we examined the effect of the intervention on motivation and learning outcomes compared to an active control group. The results revealed that the metacognitive intervention produced a shift toward a more malleable intelligence belief, which in turn led to a more positive conception of effort. It also modified their memory strategies, leading to better memory performance. The paper discusses the effectiveness of metacognitive programs that combine motivational and strategic elements, highlighting their potential to foster academic outcomes. This integrative approach may significantly enhance children's metacognitive capacities, contributing to improved academic achievement.