Lee K, Khng KH, Ng SF, Ng JLK. Longer bars for bigger numbers? children’s usage and understanding of graphical representations of algebraic problems. FLR [Internet]. 2013 Aug. 23 [cited 2025 Feb. 27];1(1):81-96. Available from: https://flr.journals.publicknowledgeproject.org/index.php/journal/article/view/49