By School Mathematics Project
By Robert Haese, Sandra Haese, Pamela Vollmar
By Robert Haese, Sandra Haese, Kim Harris
By Christopher Green
By John Berry
By Judita Cofman (Teacher of Mathematics, Teacher of Mathematics, Putney High School)
By P. J. Giblin, I.R. Porteus
By Brian Bolt
By Judita Cofman (Professor, Mathematics Institute, Professor, University of Erlangen)
By J.R. Irwin
By D. Rayner
By Gold Stars
By Paul Broadbent, Peter Patilla
By David Mitchell
By David Green, Peter Armstrong, Richard Bridges, The Mathematical Association
By Tracey Steffora
By Rose Griffiths
By Pearce, Chris
By Wilbert Reimer, Luetta Reimer
By Wilbert Reimer
By richard-parsons, CGP Books
By Maisie Chan
By Maths - No Problem!
By Peter Robson
By Michael Haese, Sandra Haese, Robert Haese, James Foley, Alison Ryan
By Jim Haskins
By Owen, Anna, Lumb, Steve, Collins Big Cat, Moon, Cliff