Abstract
The Calculators in Primary Mathematics project was a long-term investigation into the effects of
the introduction of calculators on the learning and teaching of primary mathematics. A wide variety
of qualitative and quantitative data was collected. This paper analyses differences on a test of
arithmetic using calculators, between Grade 3 and 4 children who had been in the project for at least
3 years and a control group. All children handled whole number calculations equally well, the
difficulty being determined only by how many transfers from paper to calculator and vice versa were
required. Project children were better able to handle calculations involving decimals or negative
numbers and to identify the appropriate operation to be used in a word problem. This very
important observation is supported by data from another source.