Professor Rose Griffiths teaches at the University of Leicester on the Primary PGCE and on courses for experienced teachers. Rose has worked in pre-school settings, primary, special and secondary schools, and in adult and family education. She is a well-established author of materials for children, parents and teachers. Dr Sue Gifford works in primary mathematics education at the University of Roehampton, with preservice and practising teachers on Masters level courses. She was previously a London primary teacher and a mathematics advisory teacher. Her research interests are in early years mathematics education and children with mathematics difficulties. Dr Jenni Back is a freelance consultant in mathematics education with experience in teaching mathematics to children aged 3 to 19 years. She has been involved in initial teacher education and at Masters level with primary and secondary teachers at Middlesex University and the Centre for Innovation in Mathematics Teaching at Plymouth University.