This research aims to close the gap in knowledge of self-reported knowledge and overclaiming in children. A questionnaire was developed to measure this in a sample of 897 third grade children. Three perspectives were discussed":" overclaiming as a result of deliberate self-enhancement, a proxy for declarative knowledge, and an indicator of creative engagement. The results of the study showed that individual differences in self-reported knowledge were strongly inflated by overclaiming, and only weakly related to declarative knowledge, similar to findings in adult samples.