Abstract
Key features of developing multiplicative structure were analysed from case studies of twentyfour students representing extremes in mathematical ability. Data drawn from a longitudinal study from Years 2 through 5 of schooling indicated that low ability students represented multiplicative situations without structure and development progressed from the use of pictorial to ikonic representations. Absence of any underlying structures persisted through to the end of Year 5 for half of these students. From the outset in Year 2, high ability students used notational representations with well-developed structures, and dynamic imagery featured strongly in their responses.