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Children’s performance in Experiment 2. (a) Accuracy on the non-symbolic addition task (error bars represent s.e.m.) (b) Correlation between children’s performance on non-symbolic addition task and scores on the school’s mathematics test (c) Correlation between children’s performance on tests of symbol mastery and performance on the school’s mathematics test. (d) Correlation between children’s performance of non-symbolic addition and performance on tests of symbol mastery.
