The math skills of most adults with dyscalculia are arrested at the 4th grade level; but even when testing at 4th grade, almost all will demonstrate deficient first, . The Dyscalculia Toolkit: Supporting Learning Difficulties in Maths [Ronit Bird] on wulconf.com *FREE* shipping on qualifying offers. The new edition of the best-selling Dyscalculia Toolkit continues to meet the needs of specialist and non-specialist teachers working with learners aged 6 to 14 years who have difficulty with . What is dyscalculia? Dyscalculia is a specific learning disability (or difficulty) in mathematics. It was originally defined by the Czechoslovakia researcher Kosc , as a difficulty in mathematics as a result of impairment to particular parts of the brain involved in mathematical cognition, but without a general difficulty in cognitive function.