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Hereditary and Environmental Components of Quantitative Reasoning

A multitude of investigators have tackled the problem of individual differences in mathematical ability. Two of their primary concerns have been to answer the basic questions: "Is mathematical ability largely innate or learned?" and "Why do boys do better in math than girls?" First, some pertinent studies will be summarized, and then new evidence will be presented about the origin of differences in math­ ematical ability and one possible cause of the sex differences.