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This study explored the effectiveness of the think-pair-share (TPS) method combined with the inquiry-based learning (IBL) of mental mathematics to improve teacher trainees' mathematical efficiency. School Mathematics teachers are expected to develop numeracy skills and confidence in their students. Inquiry-based teaching is an academic methodology that invites learners to explore educational contents by investigating, posing, and solving questions to create interest and class engagement. When working as a group, students first think individually and then share ideas with classmates, making learning more effective. The teacher candidates' mathematical efficiency was compared between before and after such training at various stages. Findings concluded that as students applied mental strategies, they developed a better understanding of number relations and encouraged creativity and efficiency.