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Abstract.— Children in the third grade in a normal class and children poor in mathematics attending special classes solved all additions with the sum of the two positive addends smaller than 10. The cognitive processes leading to the solutions were described in relation to a process model predicting solution times. The general model included a counter with two operations, setting and incrementing by one unit. It is assumed that solutions are obtained either by direct retrieval from memory or by a reconstructive process. The first step in this process is finding the starting point for the counter which is the greater addend. When the problem has been defined and the starting point has been found the generation of the answers starts by the counter stepping the number of units denoted by the smaller addend. The results based mainly on latencies showed that children poor in mathematics, in addition to a slower processing rate, seemed to have difficulties in the choice of strategy for processing the information in a problem.
Svenson et al. (Mon,) studied this question.