Lots of adults (and children) struggle with math anxiety and otherwise have negative attitudes towards math! In our lab, we’ve linked math anxiety to adults’ fraction reasoning and other measures of ratio reasoning:
Sidney, P. G., Thalluri, R.*, Buerke, M.*, & Thompson, C. A. (2019). Who uses more strategies? Linking mathematics anxiety to adults’ strategy variability and performance on fraction magnitude tasks. Thinking and Reasoning, 25(1), 94-131. DOI: 10.1080/13546783.2018.1475303
Choi, S. S.*, Taber, J. M., Thompson, C. A., & Sidney, P. G. (2020). Math anxiety, but not induced stress, is associated with objective numeracy. Journal of Experimental Psychology: Applied, 26(4), 604-619.
And, we have documented more negative attitudes towards fractions than other types of elementary school math:
Sidney, P. G. 1, Thompson, C. A. 1, Fitzsimmons, C., & Taber, J. M. (2021). Children’s and adults’ math attitudes are differentiated by number type. Journal of Experimental Education, 89, 1-32. DOI: 10.1080/00220973.2019.1653815