Abstract
Summary. This study was designed to replicate and extend Roberts' efforts at classifying computational errors. 198 third‐ and sixth‐grade pupils were administered an 84‐item arithmetic computation test. Those items identified as having incorrect responses were analysed to infer probable student approaches or misconceptions leading to those responses. According to their commonalities, these inferences were clustered to form error types. This procedure resulted in the identification of eight types of errors, two of which corresponded to error types described by Roberts. These were basic fact, grouping, inappropriate inversion, incorrect operation, defective algorithm, incomplete algorithm, identity and zero errors. Finally, examining the distribution of errors according to these eight types led to several tentative generalisations.
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