Abstract
Forty-three children, aged 8 and 9, were interviewed about their understanding of informal
and formal measurement. Results showed that they visualised units accurately if the number
of units was small. For many this was their preferred method of measuring. When asked to
iterate an informal unit or use rulers in unconventional ways, they made errors that indicated
ignorance of many of the unwritten rules of measurement. Successful children used
visualization and the width of a finger to measure.
Kathryn C. Irwin & Fiona Ell
Visualising And The Move From Informal To Formal Linear Measurement