By John Davies, Bernard Connors
By CGP Books
By School Mathematics Project
By Evans, Kevin, Gordon, Keith, Senior, Trevor, Speed, Brian
By Letts GCSE
By Neill, Hugh, Quadling, Douglas
By Shannon, Peter
By McGuire, Peter, Smith, Ken
By Patmore, Mark, Seager, Brian
By Vorderman, Carol, Buckwell, G.D., Lewis, Gareth
By Dawson, Richard
By Gardner, Ian
By Murray, Les
By Wardle, M.E.
By David Baker, Lynn Byrd, Simon Longman, Graham Macphail, Kathryn Scott, Paul Hogan
By Perry, Claire, Turpin
By Baines, Andrew, Bond 11+
By Broadbent, Paul, Davis, Rob, Connell, Tom, Malcolm, Martin, Casey, Catherine
By Vorderman, Carol