Divergent thinking and convergent thinking play a very important role in a person's creative thinking process to solve problems and these two types of thinking are related to hemispheric functions that will affect the way a person perceives information processing. This makes research important. The purpose of this study was to obtain a picture of divergent thinking and convergent thinking in the mathematical creative thinking process in terms of brain dominance. The research method used is qualitative with a descriptive exploratory approach. The instruments used were mathematical creative thinking questions, brain dominance tests, and unstructured interviews. The result of this research is that students who dominate the left brain in the creative thinking process are more dominant in convergent thinking, students who dominate the balanced brain in the creative thinking process are balanced in divergent thinking and convergent thinking, while student who dominate the right brain in the creative thinking process are more dominant in divergent thinking.