By School Mathematics Project
By Abbey, Sally, Pointer, Lynne, Easterbrook, Trevor
By McDaniel, Yvette
By Carol Vorderman, Vorderman, Carol
By CGP Books, CGP Books
By Neill, Hugh, Quadling, Douglas
By Ann Montague-Smith
By Scottish Primary Mathematics Group, Matthews, Bethan, etc.
By Griffiths, Rose
By Hopkins, Liz
By Fisher, Robert, Vince, Alan
By Owen, Annie
By SPMG, Scottish Primary Maths Group
By Prim-ed Publishing
By Rosemary Russell
By McDougall, Susan
By E. Albany, Anne Woodman, Albany, E., Woodman, Anne
By Nash, Jenny
By Heal, Val
By Trisha Henley, Henley, Trisha
By Wright, Andrew