This research is based on the fact that the understanding abilities of student mathematics o is low. The Purpose of this research was to know the mathematics comparison result mathematics understanding ability between the students get Contextual Teaching and Learning (CTL) and metacognitive. The research method is used quasi experiment, with a significant level of 1%. After perform posttest of can taken by conclusion that mathematics understanding ability between students\u27 who getting Contextual Teaching and Learning (CTL) as the same ability degree as metacognitive learning