The objective of this research is to study the understanding and practices of Mathematics teachers on the application of 21st century learning in high schools in Miri, Sarawak. By using a quantitative approach, a questionnaire instrument was constructed and adapted from previous studies that focused on Mathematics teachers in Miri secondary schools as a sample of this study. The research outcome showed that Mathematics teachers have a high level of knowledge in 21st century learning. The application of 21st century learning for cognitive aspect, affective and psychomotor is at a moderate-high level. The statistical analysis one-way ANOVA shows that teachers' understanding of 21st century learning based on teacher's age was found to be insignificant at the value of F (df = 3, 90) = 1.060, p> 0.05 while for teachers' understanding of 21st century learning based on teachers' experience in teaching Mathematics was also not significant at F (df = 4, 89) = 1.931, p> 0.05. In conclusion, Math.....

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