DYSCALCULIA
Dyscalculic learners generally lack an intuitive grasp of numbers (Butterworth, 2005).
Many dyscalculics experience persistent failure in recall of arithmetic facts and proceedures (D'Arcangelo, 2001), or have severe difficulty performing arithmetic calculation (Marcaruso & Sokol, 1998).
Individuals with dyscalculia have average to high IQs (Landerl, Bevan & Butterworth, 2004) and often excel in other academic and creative areas (www.dyscalculia.org).
Children with DD often have perceptual motor and attention defecits (Neumarker, 2000). In fact, dyscalculia is often co-diagnosed with ADHD (Landerl, Bevan & Butterworth, 2004; Shalev, 2004).
Developmental dyscalculia persists through late adolescence into adulthood in about half of affected individuals (Shalev, Manor & Gross Tsur, 2005)