Derek Haylock is an education consultant and writer in the field of mathematics education. He is a Senior Fellow in Education at the University of East Anglia, Norwich, where he worked for over 30 years in primary teacher training and in education research. He is a major author in education, with a large number of published books and chapters in books. His best-selling "Mathematics Explained for Primary Teachers" (Sage) has been the leader in the field for many years, with a fourth edition published in 2010. Derek s work is characterized by a commitment to explain mathematics in simple and acc...