Abstract
This paper presents the findings of a study that examined the results of 120 students selected
according to their performance levels in mathematics in Year 1 to Year 5. The results show
that while most high-ability students had a conceptual understanding of length, the majority of
the lower-ability students did not acquire important concepts relating to the linear nature of
units and took longer to acquire basic measuring skills. This knowledge is essential for its
application in perimeter, area and volume, and in topics that rely on the understanding of
scales, such as directed number gauges, and graphs.
Philippa Bragg & Lynne Outhred
What Is Taught Versus What Is Learnt: The Case Of Linear Measurement