Study of Developmental Dyscalculia:Focused on the Acquisitionof Number Concept and Fraction Concept

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・Investigation study: The acquisition process of calculation or concept of Math fraction for children in 1grade to 6 grade’s regular classes in a elementary school was cleared.・Case study: The effective intervention method depend on each unbalanced cognitive abilities for acquisition of Math fraction for two children who are in the different grade with Math learning disability was developed.・Case study: The interventions of Math depend on each unbalanced cognitive abilities to three children in elementary school, junior high school, high school, with math learning disabilities develop their self-effective sense.