ENTo develop creative thinking skills while learning mathematics in primary school, it is important to have a description of creative thinking skills and an instrument to measure these skills. The article presents: 1) a description of creative thinking skills, 2) a tool developed by the authors, empirically tested, and substantiated for measuring creative thinking skills (test), 3) the results of research analysis by groups of creative thinking skills (exploration and ideas generation; formulating questions and finding solutions) and gender. Keywords: creative thinking skills, mathematics, primary school. [From the publication]