Moorcraft, Paul, It just doesn't add up : explaining dyscalculia and overcoming number problems for children and adults / Paul Moorcraft. - 174 pages : illustrations (black and white) ; 22 cm Includes index. ISBN: 9781908691859 (paperback) : £12.00 1908691859 Nat. Bib. No.: GBB5D8908 bnb Subjects--Topical Terms: Acalculia.Learning disabilities.