"Brian Butterworth has been a leading researcher in the field of dyscalculia for a number of years... Butterworth’s book contains a great deal of useful explanation of the different types of number sense which would be essential for anyone considering assessing for dyscalculia." - Janet Desmet MDG, Dyslexia Review"This book answers the question ‘Why?’, gives structure to ‘How do I help?’ and keeps the dyscalculic individual centre stage! Highly recommended." - June Boschen, nasen Connect"Butterworth wishes to see more training of professionals in this field, including educational psychologists. This would be a useful textbook for this purpose. Recommended for: specialist teachers and educational psychologists to expand knowledge of this topic." - John Wilkins, Educational Psychology in Practice