Dyscalculia: News from the web:

A thesis from 1996 had as purpose:

The purpose of this study was to examine how spatial
abilities as measured on the Kaufman Assessment Battery for
Children (K-ABC) could be used to predict dyscalculia.

Spatial abilities were found to be most closely approximated on the
Spatial Memory subtest in the ability battery. This subtest
was examined in relationship to the Arithmetic subtest on the
achievement battery, and a high correlation was demonstrated.

This is interesting because there was critisism about the traditional way of assessing Dyscalculia by comparing ability (IQ) with achievement and this was a great measure to serve as an alternative.

Read all about it: HERE