While the participants worked with mathematics tasks described in section 2 (see Tables 1e3 andFigs. 1 and 2), eye-fixations and dwell time were recorded. Mean values of these variables as presentedin the supplementary Excel file. Participant scores on Raven's Advanced Progressive Matrices andOperation Span are also included, as well as mathematical practice and test scores. The data filecomprises two pages: the first contains the gathered data, as indicated above, and the second containsexplanations of the abbreviated variables.