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Cognitive, neuropsychological, and genetic correlates of mathematical achievement and mathematical disability (MD) are reviewed in an attempt to identify the core deficits underlying MD in children. Three types of distinct cognitive, neuropsychological, or cognitive and neuropsychological deficits associated with MD are identified. The 1st deficit is manifested by difficulties in the representation or retrieval of arithmetic facts from semantic memory. The 2nd type of deficit is manifested by problems in the execution of arithmetical procedures. The 3rd type involves problems in the visuospatial representation of numerical information. Potential cognitive, neuropsychological, and genetic factors contributing to these deficits and the relationship between MD and reading disabilities are discussed. Finally, suggestions for the subtyping of math disorders are offered.(PsycINFO Database Record (c) 2016 APA, all rights reserved)