Abstract
Since 1990 nine cohorts of preservice teachers in Australia and the USA have been given the task of ordering five decimals and asked to explain their reasoning. Data were collected via written explanations or interviews. The percentages of students in all cohorts with incorrect ordering of the decimals were disturbing but were similar to those from other studies with preservice and practising primary teachers. Written explanations for incorrect response were sorted into 11 categories. Patterns of responses and similarities with the results of the previous studies among upper primary/lower secondary students were found .. In particular, evidence was found for usage of three rules found in previous research. The strategies used by students who were successful at the task were also examined for insights into students' constructions of decimals.
Ian John Putt
Preservice Teachers’ Construction Of Decimal Numbers