Impairment of Number Concepts and Calculations：Case of an Adult with Developmental Dyscalculia

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Key Points

To investigate the impairment of number concepts and calculation abilities in an adult with developmental dyscalculia.
Case analysis of an adult with developmental dyscalculia.
Assessment of number concept understanding, arithmetic facts, and calculation methods.
Comparison of findings with previous reports on similar cases.
The individual could not judge sizes for single-digit numbers over 5.
Difficulty in recalling basic arithmetic facts and performing multi-digit calculations was noted.
Different underlying structures of number concepts for single-digit versus multi-digit numbers were suggested.

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Case report reveals calculation impairment in an adult with developmental dyscalculia, highlighting the complexity of number concepts.

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Maki Nagatomo (2026) studied this question.

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