The prime objective of this research was to investigate whether the Montessori method of learning helped kindergarten pupils improve their mathematical proficiency, critical thinking and problem-solving skills, besides training them to be responsible learners. Quantitative, qualitative, and observational methods were employed in the investigation. The sample for the study comprised 180 kindergarten pupils from "TadikaBestari Al-Hidayah," located in Bandar Seri Damansara, Malaysia. The instruments for collecting data were questionnaires, interviews, and field observations. Results from a pre-test and a post-test showed that pupils who used the Montessori method, i.e. the experimental group, outperformed (72.2% passed) their peers who were not ex- posed to the Montessori method (39% passed). The findings indicated that the Montessori method indeed helped learners to improve their mathematical proficiency. This research offers guidelines to future researchers on alternative learning methods, especially for very young children. The findings of this empirical research could be prototyped for learning other subjects.