The aim of the present research is to examine the effect of consanguineous marriage on the dyscalculic rate among four groups, consisted of Dyscalculic children of first cousin parents, second cousin parents and several generations parents, in comparison to children of nonrelatives parents. Therefore, a dyscalculic test consisted of the four mathematical skills was prepared by a team of experts and given to the children on their schools. The dyscalculic test included the four basic mathematical skill: addition and subtraction, completing the series, multiplication and division and reading task. The findings of the study revealed the effect of consanguineous marriage on the dyscalculic rate among children of related parents. The failure among children of relative’s parents was significantly greater compared to children of nonrelatives parents on the dyscalculia recognition test. Moreover, the study found a significant differences among the Several generations cousins’ group compared to the other groups. The Several generations cousins group performed significantly lower at all four mathematical skills compared to the other groups.

Dyscalculia, Arab Community, Blood related marriages, parents as cousin, Unrelated parents.