Dyscalculia:
jamiet's reviews: "Free! E-book &What is dyscalculia?& - B Adler - MathematicsScreening - 200 [dyscalculiainfo.org]
Have you ever heard of a learning disability called Dyscalculia (or dyscalcula) (aka acalculia)? It's a learning disability that involves math skills. In the simplest of terms, dyscalculia causes people to have increased difficulty understanding and learning arithmetic. All those weird symbols, the numbers everywhere, and just what to do with them.

dyscalculia.org [dyscalculia.org]

dyscalculiainfo.org [dyscalculiainfo.org]

en.wikipedia.org/wiki/Dyscalculia [wikipedia.org]

dyscalculia.org/Edu563.html [dyscalculia.org]

ncld.org/index.php [ncld.org]

ldonline.org/indepth/math [ldonline.org]