Mastering composite figure problems is essential in Singapore’s primary school curriculum, forming the foundation for geometry and real-life problem-solving. This study examines the types of misconceptions students may have in the topic of composite figure using error analysis. Undergraduates (n = 15) from non-Mathematics courses were tasked to solve some questions and explain their thought processes. Notable errors include visualisation errors, over-reliance on procedural methods, and the misinterpretation of terms. These results emphasise the importance of conceptual understanding in mathematics instruction.