Abstract
Sixteen Year 3 students, in groups of four, worked collaboratively on numeration tasks, using either conventional blocks, or computer software. Participants were interviewed individually before and after group sessions to ascertain place-value understanding. From a teaching experiment design, using a grounded theory approach, emerged previously reported categories of response, including counting approaches, grouping approaches, and "face-value" thinking. A previously unreported construct emerged, the "independent-place construct". Teachers of young children should familiarise themselves with these common approaches to place-value tasks.